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 h English (en)== Description ([[Specifications]]) ==
Atmospheres have a mix of different gases, 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. 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}}
 
=== World Atmosphere Classification Codes Table ===
As a generality, small [[world]]s have insufficient [[gravity]] to maintain an atmosphere and tend to have [[Thin Atmosphere|thin]] 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"
|-
!colspan="9"| Atmospheric Code Descriptions
|-
! [[Symbol]]
! Code 
! Specific Description
! General Description 
! Pressure ([[Atm]])
! Remarks
|-
| [[File: ATM-0-T5-Fan-Andy-Bigwood 22-Oct-2019a.jpg|100px]]
| 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]].
|-
| [[File: ATM-1-T5-Fan-Andy-Bigwood 22-Oct-2019a.jpg|100px]]
| 1  
| [[Trace Atmosphere|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]].
|-
| [[File: ATM-2-T5-Fan-Andy-Bigwood 22-Oct-2019a.jpg|100px]]
| 2  
| [[Very Thin Atmosphere|Very Thin]] / [[Tainted Atmosphere|Tainted]] 
| [[Vacuum]] 
| 0.10-0.42
| [[Very Thin Atmosphere|Very Thin]] tainted requires a [[filter respirator combination]]
|-
| [[File: ATM-3-T5-Fan-Andy-Bigwood 22-Oct-2019a.jpg|100px]]
| 3  
| [[Very Thin Atmosphere|Very Thin]]
| [[Vacuum]]  
| 0.10-0.42
| [[Very Thin Atmosphere|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.
|-
| [[File: ATM-4-T5-Fan-Andy-Bigwood 22-Oct-2019a.jpg|100px]]
| 4  
| [[Thin Atmosphere|Thin]] / [[Tainted Atmosphere|Tainted]]
| [[Thin Atmosphere|Thin]] 
| 0.43-0.70
| [[Tainted Atmosphere|Tainted]] requires a [[filter mask]]. The atmosphere contains an unusual taint such as such as [[Diseases & Plagues of Charted Space|disease]], a hazardous gas mix, [[pollutant]]s, or sulfur compounds which requires the use of a [[filter mask]]. 
|-
| [[File: ATM-5-T5-Fan-Andy-Bigwood 22-Oct-2019a.jpg|100px]]
| 5  
| [[Thin Atmosphere|Thin]] 
| [[Thin Atmosphere|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.
|-
| [[File: ATM-6-T5-Fan-Andy-Bigwood 22-Oct-2019a.jpg|100px]]
| 6  
| [[Standard Atmosphere|Standard]]
| [[Standard Atmosphere|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.
|-
| [[File: ATM-7-T5-Fan-Andy-Bigwood 22-Oct-2019a.jpg|100px]]
| 7  
| [[Standard Atmosphere|Standard]] / [[Tainted Atmosphere|Tainted]]
| [[Standard Atmosphere|Standard]]
| 0.71-1.49
| [[Tainted Atmosphere|Tainted]] requires a [[filter mask]].
|-
| [[File: ATM-8-T5-Fan-Andy-Bigwood 22-Oct-2019a.jpg|100px]]
| 8 
| [[Dense Atmosphere|Dense]] 
| [[Dense Atmosphere|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.
|-
| [[File: ATM-9-T5-Fan-Andy-Bigwood 22-Oct-2019a.jpg|100px]]
| 9 
| [[Dense Atmosphere|Dense]] / [[Tainted Atmosphere|Tainted]]
| [[Dense Atmosphere|Dense]] 
| 1.50-2.49
| [[Tainted Atmosphere|Tainted]] requires a [[filter mask]].
|-
| [[File: ATM-A-T5-Fan-Andy-Bigwood 22-Oct-2019a.jpg|100px]]
| A (10) 
| [[Exotic Atmosphere|Exotic]]
| [[Exotic Atmosphere|Exotic]] , Conventional   
| varies
| An unusual gas mix which requires the use of [[oxygen tank]]s, but [[protective suit]]s are not needed.
|-
| [[File: ATM-B-T5-Fan-Andy-Bigwood 22-Oct-2019a.jpg|100px]]
| B (11)
| [[Corrosive Atmosphere|Corrosive]]
| [[Exotic Atmosphere|Exotic]] , Conventional   
| varies
| 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]].
|-
| [[File: Atm-C-T5-Fan-Andy-Bigwood 22-Oct-2019a.jpg|100px]]
| C (12)
| [[Insidious Atmosphere|Insidious]]
| [[Exotic Atmosphere|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.
|-
| [[File: ATM-D-T5-Fan-Andy-Bigwood 22-Oct-2019a.jpg|100px]]
| D (13) 
| [[Dense Atmosphere|Dense]], [[High Pressure Atmosphere|high]]
| [[Exotic Atmosphere|Exotic]], Unusual 
| 2.5 or greater {{Page cite|name= Core Rulebook|version=Mongoose Traveller|page=170}}
| 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.
|-
| [[File: ATM-E-T5-Fan-Andy-Bigwood 22-Oct-2019a.jpg|100px]]
| E (14) '''<sup>†</sup>'''
| [[Ellipsoid Atmosphere|Ellipsoid]] '''<sup>†</sup>'''
| [[Exotic Atmosphere|Exotic]], Unusual 
| 0.5 or less {{Page cite|name= Core Rulebook|version=Mongoose Traveller|page=170}}
| Typically no survival gear required under many conditions. The world’s surface is [[Ellipsoid World|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.
|-
| [[File: ATM-F-T5-Fan-Andy-Bigwood 22-Oct-2019a.jpg|100px]]
| F (15) '''<sup>†</sup>'''
| [[Thin Atmosphere|Thin]], [[Low Pressure Atmosphere|low]] '''<sup>†</sup>'''
| [[Exotic Atmosphere|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).
|-
|}
'''<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.''
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