Ncert Exercises & Solutions

52. Why does the boundary between liquid phase and gaseous phase disappear on heating a liquid into critical temperature in a closed vessel? In this situation what will be the state of the substance?

(i) Boiling point of A = approximately 315 K,

B = approximately 345 K.

(ii) In a closed vessel, liquid C will not boil because pressure inside keeps on increasing.

(iii) Temperature corresponding to 60 mm = 313 K.

(iv) A liquid boils when vapour pressure becomes equal to the atmospheric pressure. However at high altitudes i.e., on, hills, water boils at low temperature due to low atmospheric pressure. But when pressure cooker is used, the vapour pressure of water is increased due to which water boils at even lower temperature within a short period of time.

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