Heat melts a solid and turns it into a liquid. Cooling freezes a liquid into a solid.
Different solids melt at different temperatures, some high, some low. These are called their melting points.
Heat can change solids into liquids or gases.
Most solids melt into liquid when they are heated.
A liquid evaporates into a gas when it is heated.
When we cool something we take heat away from it. Cooling changes a gas into a liquid, and a liquid into a solid.
A gas condenses into a liquid when it is cooled.
A liquid freezes into a solid when it is cooled.
Different solids melt at different temperatures. Ice melts at 0 degrees Celcius (0°C). Chocolate melts at about 35°C. We say that chocolate has a higher melting point than ice.
Metals, like aluminium and iron, also melt when we heat them. They have very high melting points. They have to be very hot to melt.
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