Question

How evaporation causes cooling?

Answer 1

Evaporation:-

• Evaporation is a process where the liquid state of matter is converted into the gaseous state.
• Any liquid can release its molecule into the air by using the heat that is present around it, or even using its internal heat. Hence it is also called as a surface phenomenon.
• Rate of evaporation is directly proportional to the temperature of the liquid, the higher the temperature the quicker is the rate of evaporation.
• Also if the temperature of the liquid is the same as the surrounding. it will still evaporate, that is it will still release molecules into the air.

Evaporation causes cooling:-

• During evaporation, the particle of the liquid from the environment gain energy in order to overcome the force of attraction between them.
• As a result of this, in the environment there is a loss of heat energy.
• This result in the cooling of the environment.
• For example, when we pour some acetone into our hands, we feel a cooling sensation.
• This happens because the particles gain energy from our hands and get evaporated.
• Therefore, we can say that evaporation causes cooling.