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Hydrogen and helium are the most commonly used lift gases. Although helium is twice as heavy as (diatomic) hydrogen, they are both significantly lighter than air. The lifting power in air of hydrogen and helium can be calculated using the theory of buoyancy as follows: Thus helium is almost twice as dense as hydrogen.
Using the molar volume, the mass of 1 liter of helium (at 1 atmospheres of pressure) is found to be 0.178 g. If helium is used instead of vacuum, the lifting power of every litre is reduced by 0.178 g, so the effective lift is reduced by 13.90625%. A 1-litre volume of hydrogen has a mass of 0.090 g, reducing the effective lift by 7.03125%.
Lifting gas is generally hydrogen, helium or hot air. Hydrogen gives the highest lift 1.1 kg/m 3 (0.069 lb/cu ft) and is inexpensive and easily obtained, but is highly flammable and can detonate if mixed with air. Helium is completely non flammable, but gives lower performance-1.02 kg/m 3 (0.064 lb/cu ft) and is a rare element and much more ...
The disaster of the British airship R 101 prompted the Zeppelin Company to reconsider the use of hydrogen, therefore scrapping the LZ 128 in favour of a new airship designed for helium, the LZ 129. Initial plans projected the LZ 129 to have a length of 248 metres (814 ft), but 11 m (36 ft) was dropped from the tail in order to allow the ship to ...
Helium is inert - it does not react with other substances or combust - and its atomic number is 2, making it the second lightest element after hydrogen. Rockets need to achieve specific speeds and ...
The shift from hydrogen to helium lift gas in 1923 seriously degraded the OB-1's performance. The OB-1 was damaged on 6 October 1923 and never flew again as the forthcoming TA type airship would meet the training role. OB-1 was declared surplus at the end of 1923. [4]
The Navajo Nation Council is considering lease agreements for helium exploration, but community members are opposed, citing a lack of transparency. Why some Navajo community members oppose a plan ...
The debate over electric vehicle (EV) targets has reignited as the government reviews its 22 per cent EV sales mandate, rising annually to a 2035 petrol and diesel ban.