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CBSE Class 11-science Answered

Give reasons for the following: (i) Glycerine is more viscous than water (ii) Evaporation causes cooling
Asked by Topperlearning User | 17 Jun, 2016, 12:05: PM
answered-by-expert Expert Answer

(i) Glycerine has stronger intermolecular forces than water hence, it is more viscous than water.

(ii) Evaporation causes cooling because the molecules that undergo evaporation are high energy molecules so the kinetic energy of molecules which are left behind is less. Since the average kinetic energy of the remaining molecules is less the temperature of these molecules is also lower. If temperature is kept constant the distribution of kinetic energy will be same. The high energy molecules keep on escaping from the liquid into the gas phase. This phenomenon brings a cooling effect.

Answered by | 17 Jun, 2016, 02:05: PM
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