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In aviation, however, water vapor emitted in the atmosphere contributes to global warming (to a lesser extent than CO 2). [11] Liquid hydrogen also has a much higher specific energy than gasoline, natural gas, or diesel. [12] The density of liquid hydrogen is only 70.85 kg/m 3 (at 20 K), a relative density of just 0.07.
The amount of mass that can be lifted by hydrogen in air per unit volume at sea level, equal to the density difference between hydrogen and air, is: (1.292 - 0.090) kg/m 3 = 1.202 kg/m 3. and the buoyant force for one m 3 of hydrogen in air at sea level is: 1 m 3 × 1.202 kg/m 3 × 9.8 N/kg= 11.8 N
Metallic hydrogen (recombination energy) 216 [2] Specific orbital energy of Low Earth orbit ... Water 220.64 bar, 373.8 °C [citation needed] [clarification needed]
Hydrogen: 0.2476 0.02661 Hydrogen bromide: 4.510 0.04431 Hydrogen chloride: 3.716 0.04081 Hydrogen cyanide [2] 11.29 0.0881 Hydrogen fluoride [2] 9.565 0.0739 Hydrogen iodide [2] 6.309 0.0530 Hydrogen selenide: 5.338 0.04637 Hydrogen sulfide: 4.490 0.04287 Isobutane [2] 13.32 0.1164 Iodobenzene: 33.52 0.1656 Krypton: 2.349 0.03978 Mercury: 8. ...
Data from same reference as for liquid hydrogen. [21] High-pressure tanks weigh much more than the hydrogen they can hold. The hydrogen may be around 5.7% of the total mass, [22] giving just 6.8 MJ per kg total mass for the LHV. See note above about use in fuel cells. Hydrogen, gas (1 atm or 101.3 kPa, 25 °C) 141.86 (HHV) 119.93 (LHV) 0.011 88 ...
The cylinders used for emergency gas supply on diving bells are often this shape, and commonly have a water capacity of about 50 litres ("J"). Domed bottoms give a larger volume for the same cylinder mass, and are the standard for scuba cylinders up to 18 litres water capacity, though some concave bottomed cylinders have been marketed for scuba.