Lighter than air | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-04

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Lifting_gas


00:00:34 1 Gases theoretically suitable for lifting
00:00:45 1.1 Hot air
00:01:20 1.2 Hydrogen
00:02:29 1.3 Helium
00:03:38 1.4 Hydrogen and helium
00:04:43 1.5 Water vapor
00:05:32 1.6 Ammonia
00:06:10 1.7 Methane
00:07:02 1.8 Hydrogen fluoride
00:07:30 1.9 Coal gas
00:07:56 1.10 Acetylene
00:08:16 1.11 Hydrogen cyanide
00:08:44 1.12 Neon
00:09:12 1.13 Nitrogen
00:09:35 1.14 Vacuum
00:10:27 1.15 Plasma
00:10:55 1.16 Combinations
00:11:15 2 Gases impractical for lifting
00:11:25 2.1 Nitrogen
00:11:49 3 Hydrogen versus helium
00:12:36 4 High-altitude ballooning
00:12:51 4.1 Solids
00:13:06 5 Submerged balloons
00:14:51 6 Balloons on other celestial bodies
00:15:47 7 See also
00:16:51 8 References
00:17:41 9 External links
00:19:06 See also



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SUMMARY
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Because of Archimedes' principle, a lifting gas is required for aerostats to create buoyancy, particularly in Lighter-than-air aircraft, which include free balloons, moored balloons, and airships. Only certain lighter than air gases are suitable as lifting gases. Dry air has a density of about 1.29 g/L (gram per liter) at standard conditions for temperature and pressure (STP) and an average molecular mass of 28.97 g/mol, and so lighter than air gases have a density lower than this.