Question

Define evaporation. explain any two

Answer 1

evaporation is the process of conversion of a liquid into vapour at any temperature below its boiling points. there are many factors that affect evaporation like :

Temperature-The higher the temperature, the higher is the rate of evaporation. When the temperature of water is increased the water molecules gain more energy, move faster and escape at a faster rate.

Pressure-If pressure is applied on the surface of a liquid, evaporation is hindered, consider for example, the case of a pressure cooker.

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Answer 2

Evaporation is the changing of liquid into its gaseous state at any temperature below its boiling point. It is a surface phenomenon. Eg. in formation of clouds,etc.
The factors that affects evaporation are :-

1.)wind - as speed of wind becomes faster, it also becomes faster. With the increase in wind speed, the particles of water vapour move away with the wind decreasing the amount of water vapour in the surrounding. Eg. clothes dry faster in a windy day.

2.) humidity- It is the amount of water vapour present in air. The air around us cannot hold more than a definite amount of water vapour at a given temperature. If it increases, evaporation becomes slow. Eg. we feel more sweaty in a humid day.

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