Explain the following: (i) The surrounding become pleasantly warm when water in
Explain the following:
(i) The surrounding become pleasantly warm when water in a lake starts freezing in cold countries.
(ii) The heat supplied to a substance during it change of state, does not cause any rise in its temperature.
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(i) The reason is that the specific latent heat of fusion of ice is sufficiently high, so when the water of lake freezes, a large quantity of heat has to be released and hence the surrounding temperature becomes pleasantly warm.
(ii) Heat supplied to a substance during its change of state, does not cause any rise in its temperature because this is latent heat of phase change which is required to change the phase only.
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