the outer covering contracts
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basically until you decide to release the air/water or whatever from your belly
so the air bag doesn't suffocate the person
If it's in a car, hot air is just the engine's "spare" heat, therefore cost-free and cheaper than cold air...
evaporation then condensation
Deflation has a few different meanings. It can mean reducing prices in an economy. In geology, it may refer to removing rock and particles via the wind. It can also mean the process of something being released causing collapse.