GATE ME 2020 Set 2 — Question 26
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Thermodynamics → Laws & Properties → Pure Substances & Phase Change
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Question
A closed vessel contains pure water, in thermal equilibrium with its vapour at (Stage #1), as shown.
The vessel in this stage is then kept inside an isothermal oven which is having an atmosphere of hot air maintained at . The vessel exchanges heat with the oven atmosphere and attains a new thermal equilibrium (Stage #2). If the Valve A is now opened inside the oven, what will happen immediately after opening the valve?
Correct answer
(B) Hot air will go inside the vessel through Valve A
Solution
In Stage #2, the water and its vapour inside the vessel reach thermal equilibrium at . The pressure inside the vessel will be the saturation pressure of water at , which is approximately . The ambient air in the oven is at a pressure of (). Since the external pressure () is greater than the internal pressure (), hot air will rush into the vessel immediately upon opening Valve A.
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