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Watch the animation and answer the questions.

Think for Yourself...

Why does a bigger surface area increase the rate of evaporation?
Why does water evaporate faster in a warmer room?
Look at the animation again. Notice that some water particles are returning. If 50 water particles leave and 20 water particles return every second, what is the overall rate of evaporation?
How would a fan affect the rate at which water particles leave the surface?
So how can a fan speed up the rate of evaporation?
Notes: see Teachers’ Guide
teachers’ guide r1

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r1: evaporation

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