Question

The process of changing a gas (or vapour) to a liquid by cooling, is called _______________.

Answer 1

1. The process of changing a gas to a liquid by cooling, is called condensation.
2. A change of state takes place during condensation.
3. When a gas is cooled by lowering its temperature, then its particles lose so much kinetic energy that they slow down.
4. As a result, they move closer together, attract each other, and form a liquid.

Thus, the process of changing a gas (or vapour) to a liquid by cooling, is called condensation.