Explain the following:
Q. Explain the following:
(i) Gases exert pressure on the walls of the container.
(ii) Water is liquid at room temperature.
(iii) Evaporation causes cooling.
Ans.
(i) Gas particles move about randomly at high speed and hit the walls of the container.
(ii) Its melting point is lower than room temperature.
(iii) The particles of liquid absorb energy from the surroundings to regain the energy lost during evaporation. This causes cooling.
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