Explain an activity to show the factors affecting evaporation.
Explain an activity to show the factors affecting evaporation.
Activity to show the factors affecting evaporation.
Definition of evaporation: The process of changing the liquid state into a vapor state even below its boiling point is called evaporation.
Factors Affecting Evaporation are the following.
(a) Humidity of air
(b) Temperature
(c) Surface area of the liquid
(d) Speed of wind
(e) Nature of the liquid
Activity to show the factors affecting evaporation.
Diagram:
(1) 
(2) 
Procedure
1– Take 5 ml of water in a test tube (see fig 1).
2– Keep it near a window or under a fan.
3– Take 5 ml of water in an open china dish (see fig 2).
4– Keep it near a window or under a fan.
5– Take 5 ml of water in an open china dish.
6– Keep it inside a cupboard or on a shelf in your class.
7– Record the room temperature.
8– Record the time or days taken for the evaporation process in the above cases.
9– Repeat the above three steps of activity on a rainy day and record your observations.
Observation
The water kept near the window in an open china dish evaporates faster than the water kept in a test tube.
The water kept inside the cupboard will take more time to evaporate than in other places mentioned above.
On a rainy day, when the humidity of air is high, the rate of evaporation will be low and water evaporates very slowly.
Conclusion
Evaporation is a surface phenomenon and so, when the surface area of the liquid is greater, the rate of evaporation will be more.
The rate of evaporation of a liquid decreases with an increase in the humidity of air and it increases with an increase in the speed of the wind.
Activity to show the factors affecting evaporation.
Definition of evaporation: The process of changing the liquid state into a vapor state even below its boiling point is called evaporation.
Factors Affecting Evaporation are the following.
(a) Humidity of air
(b) Temperature
(c) Surface area of the liquid
(d) Speed of wind
(e) Nature of the liquid
Activity to show the factors affecting evaporation.
Diagram:
(1) (2)
Procedure
1– Take 5 ml of water in a test tube (see fig 1).
2– Keep it near a window or under a fan.
3– Take 5 ml of water in an open china dish (see fig 2).
4– Keep it near a window or under a fan.
5– Take 5 ml of water in an open china dish.
6– Keep it inside a cupboard or on a shelf in your class.
7– Record the room temperature.
8– Record the time or days taken for the evaporation process in the above cases.
9– Repeat the above three steps of activity on a rainy day and record your observations.
Observation
The water kept near the window in an open china dish evaporates faster than the water kept in a test tube.
The water kept inside the cupboard will take more time to evaporate than in other places mentioned above.
On a rainy day, when the humidity of air is high, the rate of evaporation will be low and water evaporates very slowly.
Conclusion
Evaporation is a surface phenomenon and so, when the surface area of the liquid is greater, the rate of evaporation will be more.
The rate of evaporation of a liquid decreases with an increase in the humidity of air and it increases with an increase in the speed of the wind.
