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Define the following:-
⏩Vapour Pressure
⏩Boiling Point
⏩Freezing Point
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Answer:
Vapour Pressure : Vapour Pressure also called equilibrium vapour Pressure is the pressure formed by the vapor of the liquid (or solid) over the surface of the liquid.
Boiling Point : The temperature at which a liquid starts boiling, that fixed temperature is known as boiling point.
Freezing Point : The temperature at which liquid starts freezing, that fixed temperature is known as freezing point.
Vapour pressure :- All liquids exhibit tendency for evaporation. Evaporation takes place at the surface surface of liquid . If the kinetic energy of liquid molecules overcomes the intermolecular force of attraction in the liquid state then the molecules from the surface of liquid escape into space above surface . this process is called evaporation. If evaporation is carried out in a closer container system then the vapours of liquid. Like gas molecules vapour of molecules also execute continious random motion . During the motions molecules collide with each other and also.
OR,
Vapour pressure :- The pressure of vapour in contact with its liquid or solid form.
Boiling point :-The temperature at which a liquid starts to boil.
Freezing point :- The freezing point is the temperature at which a liquid changes to a solid .The freezing point of a substance is not necessarily the same as its melting point.