Describe what happens at a particle level when a liquid evaporates.
Question
Describe what happens at a particle level when a liquid evaporates.
Solution
When a liquid evaporates, it changes from a liquid state to a gaseous state. Here's what happens at a particle level:
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In a liquid, particles are constantly moving and colliding with each other. They have different amounts of energy: some have a little, and some have a lot.
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The particles with the most energy are able to overcome the attractive forces that hold them in the liquid. These high-energy particles are located at the surface of the liquid.
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When these high-energy particles have enough energy to overcome the attractive forces, they escape from the surface of the liquid and become a gas. This process is called evaporation.
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As more and more high-energy particles leave the liquid, the average energy of the remaining particles decreases. This leads to a decrease in the temperature of the liquid, which is why evaporation causes cooling.
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The particles that have evaporated are now in
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