[h1234]

hi

can any one tell me and why that when you increase the vapour pressure the boiling point goes up but why and how?

[Borek]

What is the definition of boiling?

How does the vapor pressure depends on the temperature?

[h1234]

What is the definition of boiling?

How does the vapor pressure depends on the temperature?

boiling when the patical has higher energy and the collide more frequently

i do not know the second question of urs is the same as what i asked

[FreeTheBee]

I think you are mixing up pressure and vapour pressure. A liquid boils when its vapour pressure is equal to the pressure over the liquid. So, when the pressure outside the liquid is lowered, the boiling point is reached at a lower vapour pressure as well.
The vapour pressure increases with temperature, so when a lower vapour pressure is required for boiling it will occur at lower temperature.
A bit too many vapour pressures in there, but I hope it is clear enough

[h1234]

I think you are mixing up pressure and vapour pressure. A liquid boils when its vapour pressure is equal to the pressure over the liquid. So, when the pressure outside the liquid is lowered, the boiling point is reached at a lower vapour pressure as well.
The vapour pressure increases with temperature, so when a lower vapour pressure is required for boiling it will occur at lower temperature.
A bit too many vapour pressures in there, but I hope it is clear enough

sorry mate one thing i typed the question wrong i understand what you said perfectly but my question is why vapour pressure increase but boiling point goes down sorry that what my  question is

[FreeTheBee]

Ok, then I don't really get your question. Are you referring to the relation between boiling point and vapour pressure of different compounds?

[h1234]

Ok, then I don't really get your question. Are you referring to the relation between boiling point and vapour pressure of different compounds?

Yes mate

[FreeTheBee]

I think you can reason towards the answer with the information you have.
How is the boiling point defined?

[h1234]

I think you can reason towards the answer with the information you have.
How is the boiling point defined?

when the vapour pressure over come and equals the atmospheric pressure and then the compound boils