Describe an experiment to determine the temperature dependence of saturated vapour pressure of water.

Describe an experiment to determine the temperature dependence of saturated vapour pressure of water.

• The pressure of the air in R is shown by the mercury manometer; if its height is h, the pressure in mm mercury is P = H-h, where H is the barometer height.
• The tap is opened and the pressure above water varied using the pump to a suitable value.
• The tap is closed and water in the flask in heated until it boil.
• The temperature θ and difference in mercury levels, h, are noted and recorded.
• The saturated vapour pressure, P = (H± h) is calculated
• The procedure is repeated other values of θ and h
• A graph of P versus θ is plotted and it shows that saturated vapour pressure, P, increases with temperature, θ.

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