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As your car moves, the interaction of your tyres with the road generates a friction force - or tyre roll resistance. This friction will dissipate some of your car's kinetic energy -the energy your car has as a moving body- in the form of heat. (a bit like your hands heating up when you rub them together, that is friction) This heat will raise the tyre's temperature and therefore raise the temperature of the gas contained in your tyre. Gas tends to expand when undergoing a rise in temperature. Since it cannot expand because it's contained in the tyre, its pressure will go up. This phenomenon increases with speed, since the amount of friction is directly related to speed.

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Q: Why the pressure of gas in automobiles tires increases when automobile moves?
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