Question:
How does boiling point depend on Atomospheric pressure?
Answer:
A liquid boils at a temperature at which its vapour pressure is equal to the pressure of the gas above it.
The normal boiling point of a liquid is the temperature at which its vapour pressure is equal to one atmosphere.
Thus, (a) when the external pressure is less than 1 atmosphere, the boiling point of the liquid is lower than that of normal boiling point. (b) when the external pressure is equal to 1 atmosphere, the boiling point is the normal boiling point. (c) when the external pressure is more than 1 atmosphere, the boiling point of the liquid is higher than that of normal boiling point.
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