What are the factors affecting evaporation ? [5 MARKS]
What are the factors affecting evaporation ? [5 MARKS]
Naming : 1 mark each for five factors
There are five factors which affect the rate of evaporation:–
(i) Nature of liquid :–
Different liquids have different rates of evaporation.
A liquid having weaker interparticle attractive forces evaporate at a faster rate because less energy is required to overcome the attractive forces
(ii) Surface area of the liquid :–
The evaporation depends upon the surface area. If the surface area is increased, the rate of evaporation increases because the high energy particles from the liquid can go into gas phase only through a surface.
(iii) Temperature:–
Rate of evaporation increases with increase in temperature. This is because with the increase in temperature, more number of particles get enough kinetic energy to go into the vapour state (or gaseous state).
(iv) Humidity in the air:–
The air around us contains water vapour or moisture. The amount of water present in the air is referred to as humidity. The air cannot hold more than a definite amount of water vapour at a given temperature. If the humidity is more, the rate of vaporisation decreases. The rate of evaporation is more if the air is dry.
(v) Wind speed :–
The rate of evaporation also increases with increase in the speed of the wind. This is because with increase in the speed of the wind, the particles of water vapour move away with the wind resulting in a decrease in the amount of vapour in the atmosphere.
Naming : 1 mark each for five factors
There are five factors which affect the rate of evaporation:–
(i) Nature of liquid :–
Different liquids have different rates of evaporation.
A liquid having weaker interparticle attractive forces evaporate at a faster rate because less energy is required to overcome the attractive forces
(ii) Surface area of the liquid :–
The evaporation depends upon the surface area. If the surface area is increased, the rate of evaporation increases because the high energy particles from the liquid can go into gas phase only through a surface.
(iii) Temperature:–
Rate of evaporation increases with increase in temperature. This is because with the increase in temperature, more number of particles get enough kinetic energy to go into the vapour state (or gaseous state).
(iv) Humidity in the air:–
The air around us contains water vapour or moisture. The amount of water present in the air is referred to as humidity. The air cannot hold more than a definite amount of water vapour at a given temperature. If the humidity is more, the rate of vaporisation decreases. The rate of evaporation is more if the air is dry.
(v) Wind speed :–
The rate of evaporation also increases with increase in the speed of the wind. This is because with increase in the speed of the wind, the particles of water vapour move away with the wind resulting in a decrease in the amount of vapour in the atmosphere.
