When the opposite happens and a liquid turns into a solid, it is called freezing. Boiling and Condensation. When a liquid becomes a gas it is called boiling or vaporization. Again, at a certain temperature called the boiling point, the molecules will gain enough energy to break free and become a gas.The boiling point for water is 100 degrees C (212 degrees F).When the opposite occurs and a gas becomes a liquid, it is called condensation.gain, at a certain temperature called the boiling point, the molecules will gain enough energy to break free and become a gas. The boiling point for water is 100 degrees C (212 degrees F).