What you need:

A spoon, a candle flame and some warm water

What you do:

Heat the spoon over the candle flame.

Put a drop of warm water into the spoon.

What you observe:

The water sizzles and evaporates and the spoon becomes slightly cool.

How does the spoon become cool?

Evaporation is a cooling process. The spoon becomes cool due to the evaporation of water from it.

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