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A lifting gas or lighter-than-air gas is a gas that has a density lower than normal atmospheric gases and rises above them as a result, making it useful in lifting lighter-than-air aircraft. Only certain lighter than air gases are suitable as lifting gases.
Some airship designs that use a lighter-than-air lifting gas heat a portion of the gas, which is usually maintained in enclosed cells to gain additional lift. Heating the lifting gas causes expansion of the gas in order to further lower the density of the lifting gas, which results in greater lift.
Volume changes of the lifting gas due to temperature changes or to changes of altitude are compensated for by pumping air into internal ballonets (air bags) to maintain the overpressure. Without sufficient overpressure, the blimp loses its ability to be steered and is slowed due to increased drag and distortion.
The air-filled red balloon acts as a simple ballonet inside the outer balloon, which is filled with lifting gas. A ballonet is an air bag inside the outer envelope of an airship which, when inflated, reduces the volume available for the lifting gas, making it more dense. Because air is also denser than the lifting gas, inflating the ballonet ...
In order to provide buoyancy, any lifting gas must be less dense than the surrounding air. A hot air balloon is open at the bottom to allow hot air to enter, while the gas balloon is closed to stop the (cold) lifting gas from escaping. Common lifting gases have included hydrogen, coal gas and helium.
Gas-powered vehicles are still a great choice if you're trying to keep costs low. A mid-sized, gas-powered sedan will cost just over $1,000 more annually than the average cost of ownership of a ...
Lighter Side. Politics. Science & Tech. Sports. Weather. 24/7 Help. For premium support please call: ... Electric vs. Gas Cars: Which Is More Cost Effective in the Long Run? Show comments.
Inhaling nitrous oxide from Galaxy Gas products is the latest trend among kids who misuse laughing gas for a quick high. Here’s what parents should know.