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Thus helium is almost twice as dense as hydrogen. The lifting power in air of hydrogen and helium can be calculated using the theory of buoyancy. The buoyancy depends upon the difference of the densities (ρ air) − (ρ gas) rather than upon their ratios. The lifting force for a volume of gas is given by the equation: F B = (ρ air - ρ gas ...
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 [33] and much ...
The owners rarely complain about their cars. It's the hydrogen refueling system that gives them grief. As early as 2006, 20 hydrogen stations had been installed in California. Today, more than ...
Hydrogen internal combustion engine cars are different from hydrogen fuel cell cars. The hydrogen internal combustion car is a slightly modified version of the traditional gasoline internal combustion engine car. These hydrogen engines burn fuel in the same manner that gasoline engines do; the main difference is the exhaust product.
Unlike semi-rigid and rigid airships (e.g. Zeppelins), blimps rely on the pressure of their lifting gas (usually helium, rather than flammable hydrogen) and the strength of the envelope to maintain their shape. Blimps are known for their use in advertising, surveillance, and observation due to their maneuverability, slow speeds and steady ...
After years of developing the technology, building prototypes and even going on a world tour with a hydrogen-powered iX5, BMW is officially committing to producing hydrogen fuel-cell vehicles, the ...
Donald Trump praises Elon Musk, but vows to end America's electric vehicle mandate ‘on Day 1’ — rejects hydrogen cars because ‘they blow up’ Jing Pan October 12, 2024 at 3:55 AM