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AP® Physics 1 & 2

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Boiling Water: Heating or Cooling?

APPH12-XECXAY

Is the boiling of water a heating or cooling process on the water and why?

A

Heating - Boiling water occurs when water molecules phase change from a liquid to a gas and leave the water. These leaving gas molecules result in a decrease in the water's energy and boiling is thus considered a heating process.

B

Heating - Boiling water occurs when water molecules phase change from a liquid to a gas and leave the water. These leaving gas molecules result in an increase in the water's energy and boiling is thus considered a heating process.

C

Cooling - Boiling water occurs when water molecules phase change from a liquid to a gas and leave the water. These leaving gas molecules result in an increase in the water's energy and boiling is thus considered a cooling process.

D

Cooling - Boiling water occurs when water molecules phase change from a liquid to a gas and leave the water. These leaving gas molecules result in a decrease in the water's energy and boiling is thus considered a cooling process.