Elements and Compounds

Under the same heating conditions same power element same volume etc can water be heated to 100 degree's C faster at 2 bar pressure than at 1 bar or does it take the same time?

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December 24, 2010 7:51AM

It takes the same time. However, at a pressure of 2 bar (higher

pressure), the water will not boil at 100oC. This is because

boiling occurs at that temperature for which the saturated vapour

pressure of the liquid is equal to external pressure. Since the

external pressure has been increased, a higher temperature is

required to make the vapour pressure of the liquid become equal to

the external pressure. Hence, the boiling point increases.

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