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• Take 5 mL of water in a test tube and keep it near a window or under a fan.

• Take 5 mL of water in an open china dish and keep it near a window or under a fan.
• Take 5 mL of water in an open china dish and keep it inside a cupboard or on a shelf.
• Record the room temperature.
• Record the time or days taken for the evaporation process in the above cases.
• Repeat the above three steps of activity on a rainy day and record your observations.
• What do you infer about the effect of temperature, surface area and wind velocity (speed) on evaporation?

NCERT Class 9th Science Ch 1 Matter in Our Surroundings


From this given information we can infer that the rate of evaporation depends on factors such as temperature, surface area, humidity and wind speed.
If the temperature increases then there is an increase in evaporation because the average kinetic energy of the molecules increase and thus the evaporation also increase.
If the surface area increases then there is a scope of more molecules escaping into the air. So the more the surface area more the evaporation.
If the humidity increases then evaporation decrease because there are more molecules in the atmosphere which restrict the evaporating molecules.
If wind speed increases then evaporation also increases because the evaporated molecules are carried away to other places and as a result the humidity in that place will decrease and thus evaporation will increase.


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