Why does air compressed to a high pressure create heat?

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Why does air compressed to a high pressure create heat?

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Temperature of a gas also translates to average kinetic energy of that gas. The atoms and molecules in a large space can go so far before they bounce off one another and the wall. As you shrink the volume, you decrease that average distance they can go without bouncing, so the bouncing increases. If you stuck a thermometer in the to measure the temperature, you get more bounces on the thermometer transferring the energy so you read a higher temperature.

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