1.

When we boil a liquid in a closed vessel and open vessel ,which one take more time to boil .(Pressure cooked is closed vessel)

Answer»

Liquid can be boiled in closed container like vacuum chamber by controlling pressure but we can not boil liquid just by increasing temperature in a closed vessel for boiling, the vapour pressure of liquid must be equal to external pressure continously increases(volume is constant). There is not a particular temperature of which external pressure become equal to vapour pressure of liquid . Therefore in closed vessels, boiling cannot occurs. but in open vessels boiling occurs.

Hence, liquid in closed vessel take more times to boil.



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