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Explanation:

Given

Pressure at triple point of water, P_tp, is 40kPa

Boiling point of water, T, is 100°C

Formula used

The relation connecting the temperature ( and pressure () of a volumetric thermometer can be represented as,

Which leads us to the relation,

K

where,

P_tp = Pressure at triple point of water= 40kPa

Here, we have to find the pressure at temperature 100°C (i.e, 373.15K),

So substitute, T= 373.15K in the above equation

i.e., (Ans.)

Hence, the pressure measured at the boiling point of water is 54.64 kPa≈56 kPa