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The [[Atmosphere|Atmosphere Code]] is a [[UWP]] code to represent the breathing [[environment]] encountered on a [[world]].  
+
[[File:Comp-Prog-Dav-R-Deitrick-Starter-Trav-Page-16 16-July-2018a.jpg|right]]
 +
The [[Atmosphere|Atmosphere Code]] is a [[UWP]] code to represent the breathing (respiration) [[environment]] encountered on a [[world]].  
 
* It represents the mixture of gases and other elements that may be present on a sufficiently sized [[world]] or [[moon]].  
 
* It represents the mixture of gases and other elements that may be present on a sufficiently sized [[world]] or [[moon]].  
 
* Varying types of atmospheres require the use of [[protective clothing]] or [[mask]]s. {{Page cite|name=Worlds and Adventures|page=7}}
 
* Varying types of atmospheres require the use of [[protective clothing]] or [[mask]]s. {{Page cite|name=Worlds and Adventures|page=7}}
 
* Very small [[world]]s, [[planetoid]]s, [[asteroid]]s, and other small objects almost never have an atmosphere unless artificially modified using advanced technology.  
 
* Very small [[world]]s, [[planetoid]]s, [[asteroid]]s, and other small objects almost never have an atmosphere unless artificially modified using advanced technology.  
 
* [[Tent World]]s are an example of a world ordinarily too small to contain an atmosphere, but artificially and technologically modified to possess an atmosphere using [[paraterraforming]].
 
* [[Tent World]]s are an example of a world ordinarily too small to contain an atmosphere, but artificially and technologically modified to possess an atmosphere using [[paraterraforming]].
 +
* An [[Atmospheric Pressure|Atmosphere]] is a standard [[Third Imperium|Imperial]] [[Metric]].
 +
----
 +
Please see the following [[AAB]] [[Library Data]] articles for more information:
 +
* Observing Charted Space
 +
** [[Universal World Profile]] ([[UWP]])
 +
*** [[Starport]] ([[Sp]])
 +
*** [[Planetary Size]] (S)
 +
*** [[Atmosphere]] (A)
 +
*** [[Hydrosphere]] (H)
 +
*** [[Population]] (P)
 +
*** [[Government]] (G)
 +
*** [[Law Level]] (L)
 +
*** [[Tech Level]] ([[TL]])
 +
** PBG Sequence
 +
*** P: [[Population Multiplier|Pop Multiplier]]s
 +
*** B: [[Planetoid Belt|Belt]]s
 +
*** G: [[Gas Giant]]s
 +
*** TZ: [[Travel Zone]]
 +
** COG Sequence
 +
*** C: [[Climate]]
 +
*** O: [[Orbit]]
 +
*** G: [[Gravity]]
 +
** Other System Data
 +
*** [[Allegiance Code]] ([[AC]])
 +
*** [[Base Code]] (BC)
 +
*** [[Cultural Extension]] ([[Cx]])
 +
*** [[Economic Extension]] ([[Ex]])
 +
*** [[Importance Extension]] ([[Ix]])
 +
*** [[Sophont Code]]
 +
*** [[Trade Classification]] ([[TC]])
 +
----
  
== Description / Specifications==
+
== Description ([[Specifications]]) ==
Few worlds will be found where a single chemical makes up the entire atmosphere. Most atmospheres have a complex gas mix which will include a variety of specific elements, some in great amounts, while others are barely detectable. Atmospheric mixes include active and inert gases. On Earth, oxygen (02) is active, but forms less than 25% of the total atmosphere around us. Three times as much is nitrogen (N2), plus a few trace elements such as argon. These inert gases are not usually required by animal at plant life, and take no part in the chemical reactions essential for life (except for nitrogen, a special case). They are, nonetheless, part of the atmosphere. In this [[AAB]] article, when we refer to a specific gas such as methane making up an atmosphere, we are referring to the active element, which may make up only a fraction of the total atmospheric mix. {{Page cite|name=Exotic Atmospheres|page=3-4}}
+
Few [[world]]s will be found where a single chemical makes up the entire atmosphere. Most atmospheres have a complex gas mix which will include a variety of specific elements, some in great amounts, while others are barely detectable. Atmospheric mixes include active and inert gases. On Earth, oxygen (02) is active, but forms less than 25% of the total atmosphere around us. Three times as much is nitrogen (N2), plus a few trace elements such as argon. These inert gases are not usually required by animal or plant life, and take no part in the chemical reactions essential for [[life]] (except for nitrogen, a special case). They are, nonetheless, part of the atmosphere. In this [[AAB]] article, when we refer to a specific gas such as methane making up an atmosphere, we are referring to the active element, which may make up only a fraction of the total atmospheric mix. {{Page cite|name=Exotic Atmospheres|page=3-4}}
 
   
 
   
=== Basic Atmosphere Types ===
 
The [[UWP]] atmosphere table, in use by the [[IISS]], indicates that there are nine basic main types of atmosphere: {{Page cite|name=The Universal World Profile|page=14}}
 
# [[Vacuum]]
 
# [[Trace Atmosphere|Trace]]
 
# [[Very Thin Atmosphere|Very Thin]]
 
# [[Thin Atmosphere|Thin]]
 
# [[Standard Atmosphere|Standard]]
 
# [[Dense Atmosphere|Dense]]
 
# [[Exotic Atmosphere|Exotic]]
 
# [[Corrosive Atmosphere|Corrosive]]
 
# [[Insidious Atmosphere|Insidious]]
 
 
'''''NOTE''''': They are listed in order of pressure and density.
 
 
=== Expanded Basic Atmosphere Types ===
 
Combinations of the below atmospheres may exist and are not comprehensively listed:
 
# [[Corrosive Atmosphere]]
 
# [[Dense Atmosphere]]
 
# [[Ellipsoid Atmosphere]]
 
# [[Exotic Atmosphere]]
 
# [[High Pressure Atmosphere]]
 
# [[High Temperature Atmosphere]]
 
# [[Insidious Atmosphere]]
 
# [[Low Pressure Atmosphere]]
 
# [[Low Temperature Atmosphere]]
 
# [[Standard Atmosphere]] (Tolerable pressure, temperature, constituent gases, etc. for [[Conventional Life|conventional]] [[lifeform]]s)
 
# [[Tainted Atmosphere]]
 
# [[Thin Atmosphere]]
 
# [[Trace Atmosphere]]
 
# [[Vacuum]] ([[Interstellar Medium]])
 
# [[Very Thin Atmosphere]]
 
 
'''''NOTE''''': They are listed in [[Anglic]] alphabetical order.
 
 
 
=== World Atmosphere Classification Codes Table ===
 
=== World Atmosphere Classification Codes Table ===
As a generality, small worlds are unable to maintain a sufficient gravity to maintain an atmosphere and tend to have thinner or trace atmospheres while larger worlds grow increasingly dense. Corrosive and insidious worlds tend to be at extreme ends of the tolerable temperature spectrum.  
+
As a generality, small [[world]]s are unable to maintain a sufficient [[gravity]] to maintain an atmosphere and tend to have [[Thin Atmosphere|thinner]] or [[trace atmosphere]]s while larger worlds grow increasingly dense. [[Corrosive World|Corrosive]] and [[insidious world]]s tend to be at extreme ends of the tolerable temperature spectrum.  
  
 
:{| class="wikitable sortable" width="90%"
 
:{| class="wikitable sortable" width="90%"
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! Specific Description
 
! Specific Description
 
! General Description  
 
! General Description  
! Pressure (ATM)
+
! Pressure ([[Atm]])
 
! Remarks
 
! Remarks
 
|-
 
|-
Line 87: Line 85:
 
| [[Thin Atmosphere|Thin]]  
 
| [[Thin Atmosphere|Thin]]  
 
| 0.43-0.70
 
| 0.43-0.70
| No survival gear required. The atmosphere has a pressure of 0 43 to 0.70 atmospheres. The atmosphere is a standard oxygen/nitrogen mix, which is breathable without assistance.
+
| ''[[Shirtsleeve World]]:'' No survival gear required. The atmosphere has a pressure of 0 43 to 0.70 atmospheres. The atmosphere is a standard oxygen/nitrogen mix, which is breathable without assistance.
 
|-
 
|-
 
| 6   
 
| 6   
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| [[Standard Atmosphere|Standard]]  
 
| [[Standard Atmosphere|Standard]]  
 
| 0.71-1.49
 
| 0.71-1.49
| No survival gear required. The atmosphere has a pressure of 0.71 to 1.49 atmospheres. The atmosphere is a standard oxygen/nitrogen mix, which is breathable without assistance.
+
| ''[[Shirtsleeve World]]:'' No survival gear required. The atmosphere has a pressure of 0.71 to 1.49 atmospheres. The atmosphere is a standard oxygen/nitrogen mix, which is breathable without assistance.
 
|-
 
|-
 
| 7   
 
| 7   
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| [[Dense Atmosphere|Dense]]  
 
| [[Dense Atmosphere|Dense]]  
 
| 1.50-2.49
 
| 1.50-2.49
| No survival gear required. The atmosphere has a pressure of 1.50 to 2.49 atmospheres The atmosphere is a standard oxygen/nitrogen mix, which is breathable without assistance.
+
| ''[[Shirtsleeve World]]:'' No survival gear required. The atmosphere has a pressure of 1.50 to 2.49 atmospheres The atmosphere is a standard oxygen/nitrogen mix, which is breathable without assistance.
 
|-
 
|-
 
| 9  
 
| 9  
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| A (10)  
 
| A (10)  
 
| [[Exotic Atmosphere|Exotic]]
 
| [[Exotic Atmosphere|Exotic]]
| [[Exotic Atmosphere|Exotic]], Conventional   
+
| [[Exotic Atmosphere|Exotic]] , Conventional   
 
| varies
 
| varies
 
| An unusual gas mix which requires the use of [[oxygen tank]]s, but [[protective suit]]s are not needed.
 
| An unusual gas mix which requires the use of [[oxygen tank]]s, but [[protective suit]]s are not needed.
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| B (11)
 
| B (11)
 
| ([[Corrosive Atmosphere|Corrosive]])   
 
| ([[Corrosive Atmosphere|Corrosive]])   
| [[Exotic Atmosphere|Exotic]], Conventional   
+
| [[Exotic Atmosphere|Exotic]] , Conventional   
 
| varies
 
| varies
| A concentrated gas mix or unusual temperature creates a corrosive environment, which requires the use of a [[Hostile environment suit]] or [[vacc suit]].
+
| A concentrated gas mix or unusual temperature creates a [[Corrosive Atmosphere|corrosive environment]], which requires the use of a [[Hostile environment suit]] or [[vacc suit]].
 
|-
 
|-
 
| C (12)
 
| C (12)
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| [[Exotic Atmosphere|Exotic]], Conventional   
 
| [[Exotic Atmosphere|Exotic]], Conventional   
 
| varies
 
| varies
| The atmosphere is similar to a corrosive atmosphere, but extreme conditions cause the corrosive effects to defeat any protective measures in 2 to 12 hours.
+
| The atmosphere is similar to a [[corrosive atmosphere]], but extreme conditions cause the corrosive effects to defeat any protective measures in 2 to 12 hours.
 
|-
 
|-
 
| D (13)  
 
| D (13)  
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| [[Exotic Atmosphere|Exotic]], Unusual   
 
| [[Exotic Atmosphere|Exotic]], Unusual   
 
| varies
 
| varies
| Typically no survival gear required under some conditions. The [[Ellipsoid World]] is large and massive, with a thin atmosphere which settles to the lowest levels of the terrain. The atmosphere is unbreathable at most altitudes except the very low ones (as in depressions or deep valleys).
+
| Typically no survival gear required under some conditions. This [[world]] is large and massive, with a [[thin atmosphere]] which settles to the lowest levels of the terrain. The atmosphere is un-breathable at most altitudes except the very low ones (…as in depressions or deep valleys).
 
|}
 
|}
'''<sup>†</sup>''' - '''''NOTE''''':  In '''MgT''' and '''T5''', Atm type '''E''' is "'''Thin, Low'''", and Atm type '''F''' is "'''Unusual'''", which includes (but is not limited to) Ellipsoidal atmospheres.''
+
'''<sup>†</sup>''' - '''''NOTE''':  In '''MgT''' and '''T5''', Atm type '''E''' is "'''Thin, Low'''", and Atm type '''F''' is "'''Unusual'''", which includes (but is not limited to) Ellipsoidal atmospheres.''
  
 
=== Protective Measures Based on Atmosphere ===
 
=== Protective Measures Based on Atmosphere ===
Line 159: Line 157:
 
* ''' Codes A, B, C, D, E, and F:''' [[Exotic atmosphere]]s require the use of [[oxygen tank]]s, but [[protective suit]]s are not usually required unless corrosive or insidious.
 
* ''' Codes A, B, C, D, E, and F:''' [[Exotic atmosphere]]s require the use of [[oxygen tank]]s, but [[protective suit]]s are not usually required unless corrosive or insidious.
 
* '''Code B:''' [[Corrosive atmosphere]]s require the use of [[protective suit]]s or [[vacc suit]]s.
 
* '''Code B:''' [[Corrosive atmosphere]]s require the use of [[protective suit]]s or [[vacc suit]]s.
* '''Code C:''' [[Insidious atmosphere]]s are similar to [[corrosive atmosphere]]s, but will defeat any personal protective measures in 2 to 12 hours.
+
* '''Code C:''' [[Insidious atmosphere]]s are similar to [[corrosive atmosphere]]s, but will defeat any personal protective measures in two to twelve hours.
* '''Codes D, E, and F:''' represent "Unusual Atmospheres" with special conditions such as [[Ellipsoid Atmosphere]]s.
+
* '''Codes D, E, and F:''' represent "[[Unusual Atmosphere]]s" with special conditions such as [[Ellipsoid Atmosphere]]s.
  
== History & Background / Dossier ==
+
=== Basic Atmosphere Types ===
 +
Combinations of the below atmospheres may exist and are not comprehensively listed:
 +
# [[Corrosive Atmosphere]]
 +
# [[Dense Atmosphere]]
 +
# [[Ellipsoid Atmosphere]]
 +
# [[Exotic Atmosphere]]
 +
# [[High Pressure Atmosphere]]
 +
# [[High Temperature Atmosphere]]
 +
# [[Insidious Atmosphere]]
 +
# [[Low Pressure Atmosphere]]
 +
# [[Low Temperature Atmosphere]]
 +
# [[Standard Atmosphere]] (Tolerable pressure, temperature, constituent gases, etc. for [[Conventional Life|conventional]] [[lifeform]]s)
 +
# [[Tainted Atmosphere]]
 +
# [[Thin Atmosphere]]
 +
# [[Trace Atmosphere]]
 +
# [[Unusual Atmosphere]]
 +
# [[Vacuum]] ([[Interstellar Medium]])
 +
# [[Very Thin Atmosphere]]
 +
 
 +
=== UWP & Atmospheres ===
 +
The third digit in the [[UWP]] identifies the type of atmosphere that the [[world]] has. As a rule, only larger worlds have a [[Gravity|gravitational field]] large enough to hold on to an atmosphere, but there certainly are exceptions. An atmosphere is essentially a layer of gas or gasses that cloak the surface of the [[planet]] and there are a number of reasons why a world may or may not be lucky enough to have one. As we have already mentioned, a big world has the muscle to keep its atmosphere and the bigger the world, in all likelihood the denser (...or thicker) the atmosphere will be. Conversely, [[moon]]s and [[Planetoid|small planet]]s with relatively low surface gravities will generally have only [[trace atmosphere]]s, if they have anything at all. {{Page cite|name=The Universal World Profile|page=13}}
 +
 
 +
Other factors also come into play. A [[world]] sitting close to the [[Star|main star]] might have its atmosphere stripped away by the destructive energy of the star's [[solar wind]] sweeping past. The only chance a planet has of retaining its layer of gasses in this situation, is if it also benefits from a molten core that is producing a protective [[magnetosphere]]. Compare the [[Earth]], whose atmosphere is shielded by its magnetosphere, with [[Mars]]. The [[Mars|red planet]] has a [[Trace Atmosphere|trace]] or [[very thin atmosphere]] that was considerably thicker in ancient times, but as the planet cooled it first lost its magnetosphere and then its atmosphere. {{Page cite|name=The Universal World Profile|page=13}}
 +
 
 +
Yet there are exceptions; in the depths of the solar system, the [[moon]] [[Saturn_(world)#Mainworld_Data|Titan]] orbits the ringed planet [[Saturn (world)|Saturn]]. Titan is cold, far from the [[sun]] and seismically inactive. It has no [[magnetosphere]] and with a surface [[gravity]] of only 0.14 G should not be able to retain an atmosphere - yet it has a [[dense atmosphere]] that is 1.45 times thicker than that of [[Earth]]'s [[Jupiter_(world)#Ganymede|Ganymede]] and [[Jupiter_(world)#Callisto|Callisto]], comparable-sized [[moon]]s of [[Jupiter]], are of a similar composition but do not have atmospheres. One theory suggests that [[Saturn_(world)#Mainworld_Data|Titan]], being farther from the [[sun]] than the [[moon]]s of [[Jupiter]], was colder during its formation. Gasses were trapped in the ice at those low temperatures and later made their way into [[Saturn_(world)#Mainworld_Data|Titan]]'s atmosphere. {{Page cite|name=The Universal World Profile|page=13-14}}
 +
 
 +
== History & Background ([[Dossier]]) ==
 
All [[TL:4-6|industrial societies]] must gain an expanded understanding of atmospheres, air pressure, atmospheric constituents, gas behavior, industrial pollutants, and other factors in order to build a successful, modern interstellar starfaring society of [[TL:10-12]] or greater. The [[UWP]] is one of the external expressions of those expectations about atmospheric understandings within [[Charted Space]].   
 
All [[TL:4-6|industrial societies]] must gain an expanded understanding of atmospheres, air pressure, atmospheric constituents, gas behavior, industrial pollutants, and other factors in order to build a successful, modern interstellar starfaring society of [[TL:10-12]] or greater. The [[UWP]] is one of the external expressions of those expectations about atmospheric understandings within [[Charted Space]].   
  
 
=== Techno-Environmental Limits ===
 
=== Techno-Environmental Limits ===
No information yet available.
+
The typical [[sophont]] species needs to invent various kinds of protective equipment in order to colonize atmospheres to which it is not native.
 +
 
 +
:{| class="wikitable sortable" width="90%"
 +
|+ Techno-Environmental Limits
 +
! Atmosphere <br> (Nomenclature) Code
 +
! Minimum <br> [[TL]]
 +
! Remarks
 +
|-
 +
| [[Thin Atmosphere|5]], [[Standard Atmosphere|6]] or [[Dense Atmosphere|8]]
 +
| [[TL-0]]
 +
| No [[survival equipment]] required.
 +
|-
 +
| [[Tainted Atmosphere|4, 7 or 9]]         
 +
| [[TL:1-3|TL-3]]
 +
| [[Tainted atmosphere]]s require [[filter]]s.
 +
|-
 +
| [[Very Thin Atmosphere|2 or 3]]
 +
| [[TL:4-6|TL-5]]
 +
| [[Very thin atmosphere]]s require [[compressor]]s.
 +
|-
 +
| [[High Pressure Atmosphere|13 (D)]] or [[Low Pressure Atmosphere|14 (E)]]   
 +
| [[TL:4-6|TL-5]]
 +
| [[Unusual atmosphere]]s require a variety of protective equipment.
 +
|-
 +
| [[Vacuum|0]] or [[Trace Atmosphere|1]]         
 +
| [[TL:7-9|TL-8]]
 +
| [[Trace Atmosphere|Trace]] or [[vacuum]] atmospheres require a [[vacc suit]] and [[oxygen tank]]s.
 +
|-
 +
| [[Exotic Atmosphere|10 (A)]]           
 +
| [[TL:7-9|TL-8]]
 +
| Unbreathable atmospheres require [[oxygen tank]]s.
 +
|-
 +
| [[Unusual Atmosphere|15 (F)]]           
 +
| [[TL:7-9|TL-8]]
 +
| Unusual atmospheres such as [[ellipsoid]]s require [[survival equipment]] under selected conditions.
 +
|-
 +
| [[Corrosive Atmosphere|11 (B)]]           
 +
| [[TL:7-9|TL-9]]
 +
| [[Corrosive atmosphere]]s require a variety of capable protective equipment.
 +
|-
 +
| [[Insidious Atmosphere |12 (C)]]         
 +
| [[TL:10-12|TL-10]]
 +
| [[Insidious atmosphere]]s require a variety of heavy-duty protective equipment.
 +
|-
 +
|}
  
 
=== Atmospheric Equipment ===
 
=== Atmospheric Equipment ===
Line 180: Line 248:
 
# [[Prefabricated Cabin|Cabin, Prefabricated]]
 
# [[Prefabricated Cabin|Cabin, Prefabricated]]
 
# [[Combat Environment Suit]]
 
# [[Combat Environment Suit]]
# [[Combination Filter Mask-Respirator]] {{Page cite|citeName=WA17}}
+
# [[Combination Filter Mask-Respirator]] {{Page cite|citeName=WA17}} AKA [[Combination Mask]]
 
# [[Compressor]]
 
# [[Compressor]]
 
# [[Extended Life Support Sytem]] {{Page cite|name=High Passage 3|page=28}}
 
# [[Extended Life Support Sytem]] {{Page cite|name=High Passage 3|page=28}}
Line 207: Line 275:
 
# [[Vacc Suit]] {{Page cite|citeName=WA17}} {{Page cite|name= Twilight's Peak|page=5}}
 
# [[Vacc Suit]] {{Page cite|citeName=WA17}} {{Page cite|name= Twilight's Peak|page=5}}
  
== References and Contributors ==
+
== References & Contributors ([[Sources]]) ==
{{Intermediate}}
+
{{Advanced}}
{{Detail}}
+
 
{{Sources
 
{{Sources
|S1= {{Ludography cite|name=Worlds and Adventures|page=5}}
+
|S1= {{Ludography cite|name= Worlds and Adventures|page=5, 9, 17, 19}}
|S2= {{Ludography cite|name=Exotic Atmospheres|page=1-16}} (Special Supplement 2 from the periodical [[Journal of the Travellers' Aid Society 17]])
+
|S2= {{Ludography cite|name= Exotic Atmospheres|page=1-16}} (Special Supplement 2 from the periodical [[Journal of the Travellers' Aid Society 17]])
|S3= {{Ludography cite|name=Referee's Manual|page=22}}
+
|S3= {{Ludography cite|name= Grand Survey |page=19, 27-28, 34-35, 45}} 
|S4= {{Ludography cite|name=World Builder's Handbook|page=64-68}}
+
|S4= {{Ludography cite|name= Referee's Manual|page=22}}
|S5= {{Ludography cite|name=World Tamer's Handbook|page=11-17}}
+
|S5= {{Ludography cite|name= World Builder's Handbook|page=64-68}}
|S6= {{Ludography cite|name=First In|page=70,72}}
+
|S6= {{Ludography cite|name= World Tamer's Handbook|page=11-17, 84, 90-91}}
|S7= {{Ludography cite|name=Interstellar Wars|page=125-6}}  
+
|S7= {{Ludography cite|name= First In|page=67-73}}
|S8= {{Ludography cite|name=Mongoose Traveller Main Rulebook|page=TBD}}
+
|S8= {{Ludography cite|name= Interstellar Wars|page=125-6}}  
|S9= {{Ludography cite|name=T5 Core Rules|page=409}}
+
|S9= {{Ludography cite|name= Mongoose Traveller Main Rulebook|page=41, 137, 170-171, 179}}
|S10= {{Ludography cite|name=The Universal World Profile|page=TBD}}
+
|S10= {{Ludography cite|name= T5 Core Rules|page=409}}
|S11= [[Traveller Wiki Editorial Team]]
+
|S11= {{Ludography cite|name= The Universal World Profile|page=13-18}}
|S12= Author & Contributor: Lord (Marquis) and Master Scout Emeritus [[User: Alagoric|Adie Alegoric Stewart]] of the [[IISS]]
+
|S12= [[Traveller Wiki Editorial Team]]
|S13= Author & Contributor: Jonathan Sherlock
+
|S13= Author & Contributor: Lord (Marquis) and Master Scout Emeritus [[User: Alagoric|Adie Alegoric Stewart]] of the [[IISS]]
|S14= Author & Contributor: Lord (Marquis) and Master of Sophontology [[User:Maksim-Smelchak|Maksim-Smelchak]] of the [[Ministry of Science]]
+
|S14= Author & Contributor: Lord (Marquis) [[Jonathan Sherlock]]
 +
|S15= Author & Contributor: Lord (Marquis) and Master of Sophontology [[Maksim-Smelchak]] of the [[Ministry of Science]]
 
}}
 
}}
 
  
{{LE|Planetology|Planets}}
+
 
 +
{{LE|Planet|Planetology}}

Revision as of 19:11, 3 June 2019

Comp-Prog-Dav-R-Deitrick-Starter-Trav-Page-16 16-July-2018a.jpg

The Atmosphere Code is a UWP code to represent the breathing (respiration) environment encountered on a world.

  • It represents the mixture of gases and other elements that may be present on a sufficiently sized world or moon.
  • Varying types of atmospheres require the use of protective clothing or masks. [1]
  • Very small worlds, planetoids, asteroids, and other small objects almost never have an atmosphere unless artificially modified using advanced technology.
  • Tent Worlds are an example of a world ordinarily too small to contain an atmosphere, but artificially and technologically modified to possess an atmosphere using paraterraforming.
  • An Atmosphere is a standard Imperial Metric.

Please see the following AAB Library Data articles for more information:


Description (Specifications)

Few worlds will be found where a single chemical makes up the entire atmosphere. Most atmospheres have a complex gas mix which will include a variety of specific elements, some in great amounts, while others are barely detectable. Atmospheric mixes include active and inert gases. On Earth, oxygen (02) is active, but forms less than 25% of the total atmosphere around us. Three times as much is nitrogen (N2), plus a few trace elements such as argon. These inert gases are not usually required by animal or plant life, and take no part in the chemical reactions essential for life (except for nitrogen, a special case). They are, nonetheless, part of the atmosphere. In this AAB article, when we refer to a specific gas such as methane making up an atmosphere, we are referring to the active element, which may make up only a fraction of the total atmospheric mix. [2]

World Atmosphere Classification Codes Table

As a generality, small worlds are unable to maintain a sufficient gravity to maintain an atmosphere and tend to have thinner or trace atmospheres while larger worlds grow increasingly dense. Corrosive and insidious worlds tend to be at extreme ends of the tolerable temperature spectrum.

Atmospheric Code Descriptions
Code Specific Description General Description Pressure (Atm) Remarks
0 Vacuum Vacuum < 0.001 Vacuum requires a vacc suit. The atmosphere has a pressure of less than 0.001 atmospheres, which requires the use of a vacc suit.
1 (Trace) Vacuum 0.001-0.09 The atmosphere has a pressure of less than 0.1 atmospheres, which requires the use of a vacc suit.
2 (Very Thin / Tainted) Vacuum 0.10-0.42 Very Thin tainted requires a filter respirator combination
3 (Very Thin) Vacuum 0.10-0.42 Very Thin requires a respirator. The atmosphere has a pressure of 0.1 to 0.42 atmospheres, which requires the use of a respirator to ensure sufficient oxygen.
4 (Thin / Tainted) Thin 0.43-0.70 Tainted requires a filter mask. The atmosphere contains an unusual taint such as such as disease, a hazardous gas mix, pollutants, or sulfur compounds which requires the use of a filter mask.
5 Thin Thin 0.43-0.70 Shirtsleeve World: No survival gear required. The atmosphere has a pressure of 0 43 to 0.70 atmospheres. The atmosphere is a standard oxygen/nitrogen mix, which is breathable without assistance.
6 Standard Standard 0.71-1.49 Shirtsleeve World: No survival gear required. The atmosphere has a pressure of 0.71 to 1.49 atmospheres. The atmosphere is a standard oxygen/nitrogen mix, which is breathable without assistance.
7 (Standard / Tainted) Standard 0.71-1.49 Tainted requires a filter mask.
8 Dense Dense 1.50-2.49 Shirtsleeve World: No survival gear required. The atmosphere has a pressure of 1.50 to 2.49 atmospheres The atmosphere is a standard oxygen/nitrogen mix, which is breathable without assistance.
9 (Dense / Tainted) Dense 1.50-2.49 Tainted requires a filter mask.
A (10) Exotic Exotic , Conventional varies An unusual gas mix which requires the use of oxygen tanks, but protective suits are not needed.
B (11) (Corrosive) Exotic , Conventional varies A concentrated gas mix or unusual temperature creates a corrosive environment, which requires the use of a Hostile environment suit or vacc suit.
C (12) (Insidious) Exotic, Conventional varies The atmosphere is similar to a corrosive atmosphere, but extreme conditions cause the corrosive effects to defeat any protective measures in 2 to 12 hours.
D (13) (Dense, high) Exotic, Unusual 2.5 or greater [3] Typically no survival gear required under many conditions. Pressure at or below sea level is too great to support life but is breathable at higher altitudes.
E (14) (Ellipsoid) Exotic, Unusual 0.5 or less [4] Typically no survival gear required under many conditions. The world’s surface is ellipsoidal, not spherical. Because the atmosphere remains spherical, surface atmospheric pressure ranges from very high at the middle to very low at the ends. Breathable bands may exist at some point within the range of pressure.
F (15) (Thin, low) Exotic, Unusual varies Typically no survival gear required under some conditions. This world is large and massive, with a thin atmosphere which settles to the lowest levels of the terrain. The atmosphere is un-breathable at most altitudes except the very low ones (…as in depressions or deep valleys).

- NOTE: In MgT and T5, Atm type E is "Thin, Low", and Atm type F is "Unusual", which includes (but is not limited to) Ellipsoidal atmospheres.

Protective Measures Based on Atmosphere

The various atmosphere types require specific personal equipment for survival and protection. [5]

Basic Atmosphere Types

Combinations of the below atmospheres may exist and are not comprehensively listed:

  1. Corrosive Atmosphere
  2. Dense Atmosphere
  3. Ellipsoid Atmosphere
  4. Exotic Atmosphere
  5. High Pressure Atmosphere
  6. High Temperature Atmosphere
  7. Insidious Atmosphere
  8. Low Pressure Atmosphere
  9. Low Temperature Atmosphere
  10. Standard Atmosphere (Tolerable pressure, temperature, constituent gases, etc. for conventional lifeforms)
  11. Tainted Atmosphere
  12. Thin Atmosphere
  13. Trace Atmosphere
  14. Unusual Atmosphere
  15. Vacuum (Interstellar Medium)
  16. Very Thin Atmosphere

UWP & Atmospheres

The third digit in the UWP identifies the type of atmosphere that the world has. As a rule, only larger worlds have a gravitational field large enough to hold on to an atmosphere, but there certainly are exceptions. An atmosphere is essentially a layer of gas or gasses that cloak the surface of the planet and there are a number of reasons why a world may or may not be lucky enough to have one. As we have already mentioned, a big world has the muscle to keep its atmosphere and the bigger the world, in all likelihood the denser (...or thicker) the atmosphere will be. Conversely, moons and small planets with relatively low surface gravities will generally have only trace atmospheres, if they have anything at all. [6]

Other factors also come into play. A world sitting close to the main star might have its atmosphere stripped away by the destructive energy of the star's solar wind sweeping past. The only chance a planet has of retaining its layer of gasses in this situation, is if it also benefits from a molten core that is producing a protective magnetosphere. Compare the Earth, whose atmosphere is shielded by its magnetosphere, with Mars. The red planet has a trace or very thin atmosphere that was considerably thicker in ancient times, but as the planet cooled it first lost its magnetosphere and then its atmosphere. [7]

Yet there are exceptions; in the depths of the solar system, the moon Titan orbits the ringed planet Saturn. Titan is cold, far from the sun and seismically inactive. It has no magnetosphere and with a surface gravity of only 0.14 G should not be able to retain an atmosphere - yet it has a dense atmosphere that is 1.45 times thicker than that of Earth's Ganymede and Callisto, comparable-sized moons of Jupiter, are of a similar composition but do not have atmospheres. One theory suggests that Titan, being farther from the sun than the moons of Jupiter, was colder during its formation. Gasses were trapped in the ice at those low temperatures and later made their way into Titan's atmosphere. [8]

History & Background (Dossier)

All industrial societies must gain an expanded understanding of atmospheres, air pressure, atmospheric constituents, gas behavior, industrial pollutants, and other factors in order to build a successful, modern interstellar starfaring society of TL:10-12 or greater. The UWP is one of the external expressions of those expectations about atmospheric understandings within Charted Space.

Techno-Environmental Limits

The typical sophont species needs to invent various kinds of protective equipment in order to colonize atmospheres to which it is not native.

Techno-Environmental Limits
Atmosphere
(Nomenclature) Code
Minimum
TL
Remarks
5, 6 or 8 TL-0 No survival equipment required.
4, 7 or 9 TL-3 Tainted atmospheres require filters.
2 or 3 TL-5 Very thin atmospheres require compressors.
13 (D) or 14 (E) TL-5 Unusual atmospheres require a variety of protective equipment.
0 or 1 TL-8 Trace or vacuum atmospheres require a vacc suit and oxygen tanks.
10 (A) TL-8 Unbreathable atmospheres require oxygen tanks.
15 (F) TL-8 Unusual atmospheres such as ellipsoids require survival equipment under selected conditions.
11 (B) TL-9 Corrosive atmospheres require a variety of capable protective equipment.
12 (C) TL-10 Insidious atmospheres require a variety of heavy-duty protective equipment.

Atmospheric Equipment

Some selected equipment used in nonstandard environments with nonstandard and unusual atmospheres include:

  1. Air Tanks
  2. Atmosphere Tester
  3. Atmospheric Survival Suit
  4. Ball, Rescue
  5. Base, Advanced [9]
  6. Battle Dress
  7. Beacon, Emergency
  8. Body Pressure Suit
  9. Cabin, Prefabricated
  10. Combat Environment Suit
  11. Combination Filter Mask-Respirator [9] AKA Combination Mask
  12. Compressor
  13. Extended Life Support Sytem [10]
  14. Filter Mask [9]
  15. Filter Respirator Combination
  16. Filter Suit
  17. Gauge, Depth
  18. Gauge, Tank Pressure
  19. Hazard Suit
  20. Hostile Environment Suit
  21. Locator, Inertial
  22. Mask, Face
  23. Mask, Filter
  24. Mask, Protective
  25. Oxygen Rebreather
  26. Oxygen Tanks [9]
  27. Pre-Fabricated Cabin [9]
  28. Respirator [9]
  29. Regulator
  30. "Sniffer" Bioscanner
  31. Suit Air Conditioner
  32. Suit, Protective [9]
  33. Suit, Protective, Heavy
  34. Survival Bubble
  35. Tent, Pressure [9]
  36. Vacc Suit [9] [11]

References & Contributors (Sources)

This article was copied or excerpted from the following copyrighted sources and used under license from Far Future Enterprises or by permission of the author.

  1. Marc Miller. Worlds and Adventures (Game Designers Workshop, 1977), 7.
  2. J. Andrew Keith. Exotic Atmospheres (Game Designers Workshop, 1983), 3-4.
  3. Gareth Hanrahan. Mongoose Traveller Main Rulebook (Mongoose Publishing, 2008), 170.
  4. Gareth Hanrahan. Mongoose Traveller Main Rulebook (Mongoose Publishing, 2008), 170.
  5. Marc Miller. Worlds and Adventures (Game Designers Workshop, 1977), 9.
  6. Paul Elliott. The Universal World Profile (Zozer Games, 2016), 13.
  7. Paul Elliott. The Universal World Profile (Zozer Games, 2016), 13.
  8. Paul Elliott. The Universal World Profile (Zozer Games, 2016), 13-14.
  9. 9.0 9.1 9.2 9.3 9.4 9.5 9.6 9.7 9.8 Marc Miller. Worlds and Adventures (Game Designers Workshop, 1977), 17.
  10. Jim Cunningham. High Passage 3 (FASA, 1982), 28.
  11. Marc Miller. Twilight's Peak (Game Designers Workshop, 1980), 5.