When a small ice crystal is placed in overcooled water it begins to freeze instantaneously.
i. What amount of ice is formed from 1 kg of water over cooled to `-8^@C` ? L of water `=336xx10^3 J//kg` and s of water`=4200 J//kg//K`.
ii. What should be the temperature of the overcooled water in order that all of it be converted into ice at `0^@C` ?

Explanation

`mL = m^(1) S Delta theta , m xx 80 = 1000 xx 1 xx 8 , m = 100 g`
Saturated and Unsaturated Vapours :
(a) When the pressure exerted by a vapour is maximum it is called saturated vapour, when pressure exerted is not maximum, it is called unsaturated vapour.
(b) Saturated vapours do not obey the gas laws and saturated vapour pressure of liquid is independent of volume occupied. But unsaturated vapour obey the gas laws.
( c) At boiling point of a liquid saturated vapour pressure is equal to atmospheric pressure at that place.
Note :
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