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If you pump air into cycle tyre a slight warming effect is noticed at valve stem why

If you pump air into cycle tyre a slight warming effect is noticed at valve stem why
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If you pump air into cycle tyre a slight warming effect is noticed at valve stem why

User Wayne Fulcher
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1 Answer

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Probably the kinetic energy of rubbing the pump against the valve, combined with the increase in gas pressure in the tire itself.
User BlackSheep
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