What will happen to the boiling point of a liquid under vacuum? Will it rise or decrease?

Question

Utilisateur anonyme · Accepted Answer

it should decrease because of very little pressure. Water should boil more easily up in the mountains due to altitude.

karan · Answer

it will rise because the vapour pressure becomes zero

zhenjie · Answer

It should decrease, because according to the PVT relationship (e.g. PV=nRT), if pressure decreased, the boiling temperature should also be decreased.

Utilisateur anonyme · Answer

It will increase 
For example the boiling temperature of water is 100 C at 1 atm 
And the vacuum pressure is the pressure less than the atmospheric pressure 
Like if you are at the top of mountain And you need to boil a water but the the pressure at the top of the mountain is grader than the pressure at the surface
Then the boiling water will be less than 100C and the pressure is grader than 1 atm 
In this case the boiling temperature will be grader 
According to my example it will be grader than 100C 
My answers according to thermodynamics Table A-4  😉

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