Answer / balachandran

before answering that I have let me introduce one technical word' vapour pressure'.It is the pressure exerted by the vapour of the concerned substance with that substance at equilibrium.Usually boiling point is determined by prominancy b/w vapour pressure and atmospheric pressure.Suppose water is boiling in an open vessel,let atm prssur be 1 bar.At 1 bar ,boiling point is 100C.suppose this is boiled at a higher altitude,say 1km above sea level.atm presure reduced to .8 bar.but the vapour pressure is still constant for that liquid.Vapour pressure can oppose lower atms pressure easily than a higher atms pressure sothat vapours can easily come out out of the lid.Thus ,a liquids boling point reduces at lower atmospheric pressure.Any confusion still existing ,then mail me to bala300587@gmail.com

Answer / rakesh jaiswal

boiling occurs when vapour pressure is equal to the
atmospheric pressure means when they r in equilibrium, if
atmospherice pressure is more we need to have vapour
pressure that means molecules need more energy to overcome
the cohesive intermolecular force.

Answer / manojsiva v

The boiling point of an element or a substance is the temperature at which the vapour pressure of the liquid equals the environmental pressure surrounding the liquid.At higher surrounding atmospheric pressure,more amount of water(suppose) has to be converted into vapour state inorder to get eqalized with the surrounding environmental pressure.So to enable more amount of vapour formation means more amount of temperature required.Hence as atmospheric pressure increases,vapour pressure requirement increases and high temperature of liquid.thus higher boiling point.

Answer / anil

saturation temp.(B.P.) and pressure(Atm.pressure) are
directly proportinal to each other and so B.P increases as
atm.pre increases

Answer / manish dutta

so to know the ans of this , first we need to know the definition of boiling point ..
boiling point is the temp. at which vapour pressure of liquid equals the atmospheric pressure .. so if atm press increases then vapour pressure also increase . and to increase the vapour pressure of liquid we need to increase the temp .

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