Dense Atmosphere

A Dense Atmosphere is a type of atmosphere known for possessing a very high pressure, but is still breathable without assistance.

• However, many sophonts accustomed to standard atmospheres may breath with considerably more difficulty.

Description (Specifications)

An atmosphere rated as Dense has a mean surface pressure ranging from 1.50 atm to 2.49 atm.

Surface pressure	boiling point of water
1.5 atm	111°C
2 atm	120°C
2.5 atm	127°C

Dense, High (D): These worlds have thick N2/O2 atmospheres, but their mean surface pressure is too high to support unprotected human life (high pressure nitrogen and oxygen are deadly to humans). However, pressure naturally decreases with increasing altitude, so if there are highlands at the right altitude the pressure may drop enough to support human life. Alternatively, there may not be any topography high enough for humans to inhabit, necessitating floating gravitic or dirigible habitats or sealed habitats on the surface.

History & Background (Dossier)

No information yet available.

References & Contributors / Sources

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This list of sources was used by the Traveller Wiki Editorial Team and individual contributors to compose this article. Copyrighted material is used under license from Mongoose Publishing or by permission of the author. The page history lists all of the contributions.

• Marc Miller. Worlds and Adventures (Game Designers Workshop, 1977), 5.Marc Miller, Robert Eaglestone, Don McKinney. Worlds and Adventures (Far Future Enterprises, 2019), 5.
• J. Andrew Keith. Exotic Atmospheres (Game Designers Workshop, 1983), 1-16. (Special Supplement 2 from the periodical Journal of the Travellers' Aid Society 17)
• Marc Miller. Referee's Manual (Game Designers Workshop, 1987), 22.
• Geir Lanesskog. World Builder's Handbook (Mongoose Publishing, 2023), 64-68.Joe Fugate, J. Andrew Keith, Gary L. Thomas. World Builder's Handbook (Digest Group Publications, 1989), 64-68.
• Terrance McInnes, Dave Nilsen. World Tamer's Handbook (Game Designers Workshop, 1994), 11-17.
• Jon F. Zeigler. First In (Steve Jackson Games, 1999), 70,72.
• Paul Drye, Loren Wiseman, Jon F. Zeigler. Interstellar Wars (Steve Jackson Games, 2006), 125-6.
• Citation Missing - Mongoose Traveller Main Rulebook
• Marc Miller. T5 Core Rules (Far Future Enterprises, 2013), 409.
• Paul Elliott. The Universal World Profile (Zozer Games, 2016), TBD.
• Author & Contributor: Lord (Marquis) and Master of Sophontology Maksim-Smelchak of the Ministry of Science