The temperature of the remaining liquid increases
Boiling is the rapid vaporization of a liquid, which occurs when a liquid is heated to its boiling point.
The temperature at which the vapour pressure of the liquid is equal to the pressure exerted on the liquid by the surrounding atmosphere.
If a liquid is heated the particles are given more energy and move faster and faster expanding the liquid.
The most energetic particles at the surface escape from the surface of the liquid as a vapour as it gets warmer.
Liquids evaporate faster as they heat up and more particles have enough energy to break away.
Therefore the temperature of the remaining liquid also increases.
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