Question

5 ml of water was taken in a china dish and a test tube separately. These samples were then kept under different conditions as below:

1. Both samples were kept under a fan
2. Both samples were kept inside a cupboard.

State in which case the evaporation will be faster. Give a reason to support your answer.

Answer 1

Evaporation will be faster when both samples are kept under a fan.

• Evaporation is a process in which a liquid is changed into a gas vapour form.
• Evaporation is a surface phenomenon.
• The various factors affecting evaporation are temperature, surface area, humidity, and wind speed.
• So as we know that if the surface area increases the rate of evaporation will also increase, so the sample kept in a china dish will have a high rate of evaporation than the sample present in a test tube.
• And since a fan helps in the fast movement of the air, water will quickly get to evaporate under a fan than inside a cupboard.
• If the samples are kept inside the cupboard the outside air will not come in contact with water and therefore no evaporation can take place inside the cupboard.