Answer :

(a) We can change the physical state of matter in two ways:

(i) By changing the temperature (heating or cooling).


(ii) By changing the pressure (increasing or decreasing the pressure).


These two factors decide whether a given substance would be in a solid, liquid or gaseous state.


(b)


(c) The rate of evaporation of a liquid can be made faster by


(i) Increasing the temperature


(ii) Increasing the surface area of the liquid


(iii) Lowering humidity and


(iv) increasing wind speed.


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