Part-2. Evaporation | factors Effecting on Evaporation | ch#5 | 9th Class chemistry

Описание: Evaporation depends upon following factors:
i. Surface area: Evaporation is a surface phenomenon. Greater is surface area,
greater is evaporation and vice verse. For example, sometimes a saucer is used
if tea is to be cooled quickly. This is because evaporation from the larger
surface area of saucer is more than that from the smaller surface area of a tea
cup.
ii. Temperature: At high temperature, rate of evaporation is high because at high
temperature kinetic energy of the molecules increases so high that they overcome the intermolecular forces and evaporate rapidly. For example, water level
in a container with hot water decreases earlier than that of a container with cold
water. This is because the hot water evaporates earlier than the cold water.
iii. Intermolecular forces: If intermolecular forces are stronger, molecules face
difficulty in evaporation. For example, water has stronger intermolecular forces
than alcohol, therefore, alcohol evaporates faster than water.

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