Water and other liquids start to boil if they are heated to their boiling temperatures. The liquid starts to transform into vapors but the change of liquid into vapors goes on even when the temperature is below the boiling point. For example, when wet clothes are hung on the line, they get dry. Water present in clothes changes into vapors and disappears into atmosphere similarly, if small amount of water is left in a pot in the open air, it soon disappears. This water too changes into vapors and disappears. This phenomenon of changing of liquids into vapors without boiling is called evaporation.
Experiments have shown that evaporation of liquids depends on the following factors:
1- nature of liquid: some liquids have low boiling point, they evaporate more quickly
2- temperature of liquid: if the surface temperature is high, evaporation rate increases
3 -surface area of liquid: if the surface area of the liquid is increased evaporation rate also increases.
4- dryness of air: drier the air, quicker is the rate of evaporation.
5-wind speed: higher the wind speed, greater is the rate of evaporation.
6-air pressure on the surface of liquid: if the pressure on the surface of the liquid is lowered, its rate of evaporation shoots up.
Experiments have shown that evaporation of liquids depends on the following factors:
1- nature of liquid: some liquids have low boiling point, they evaporate more quickly
2- temperature of liquid: if the surface temperature is high, evaporation rate increases
3 -surface area of liquid: if the surface area of the liquid is increased evaporation rate also increases.
4- dryness of air: drier the air, quicker is the rate of evaporation.
5-wind speed: higher the wind speed, greater is the rate of evaporation.
6-air pressure on the surface of liquid: if the pressure on the surface of the liquid is lowered, its rate of evaporation shoots up.