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Melting and Freezing

≈ 15 min
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Heating and cooling can change matter from one state to another.

  • Melting is when a solid turns into a liquid because it is heated. Ice melts into water when it warms up.
  • Freezing is when a liquid turns into a solid because it is cooled. Water freezes into ice in a freezer.

Melting and freezing are opposites, and they are reversible: you can freeze water into ice, then melt it back into water, again and again. For water, both changes happen at 0 degrees Celsius (0 °C) — the freezing/melting point.

When ice changes into water, this change is called...

At what temperature, in degrees Celsius (°C), does water freeze?

Melting and freezing are opposite changes. Which one needs the matter to be cooled down?