Why does heat have a shadow? © Getty Images

Why does heat have a shadow?

Thermal energy is a funny old thing.

Asked by: Tess Foy, Stafford

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Thermal energy – the physicist’s term for heat – comes in various forms, including infrared radiation, which is part of the electromagnetic spectrum, like visible light. As such, this form of heat can be blocked by objects, creating a shadow. But the other forms of heat can still get to us via, for example, the motion of warm air known as convection.


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