Question

A vessel A has volume V and a vessel B has volume 2V. Both contain some water which has a constant volume. The pressure in the space above water is pa for vessel A and pb for vessel B.
(a) pa = pb
(b) pa = 2pb
(c) pb = 2pa
(d) pb = 4pa

Answer 1

The pressure in the space above water is pa for vessel A and pb for vessel B  is pa = pb

Explanation:

• Saturated vapour pressure at temperature shall be the maximum pressure attainable above the water.
• Because the pressure of saturated vapour does not depend on length, all vessels will have the same pressure.  

• vapour pressure :- A liquid's vapour pressure is the Control Vapour Pressure  above its liquid (or solid);
• In other words, the vapour pressure arising from the evaporation of a liquid (or solid) above the liquid (or solid) sample in a closed container. Substance: Examples. Vapour pressure of 25 degrees C.

Answer 2

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option A is correct. pa=pb