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Baring some curious complication, heat expands all things. When you put heat into something, it gains some of that energy. If you had warm hands and you gripped a metal rod, the metal rod would slowly heat up, it takes the heat energy from you.

On the smallest scale, heat means a material is moving around and energetic. In a cold gas, the molecules are moving around quite slowly, they have so little energy. Put energy (heat) into the gas and they will speed up and become very active...and even the gas will expand, like with a hot air balloon. (Try freezing an inflated balloon, note how it deflates a bit but re-expands when you warm it in the open air)

So metal is no different, really. The difference is small...and perhaps unnoticeable most of the time. But rest assured, the metal expands slightly due to heat.

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15y ago

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