Helium gas is enclosed in a container closed by a tight fitting piston at its end. There is some friction between the piston and the walls of the container. Initially the gas is in the situation shown

Question

Helium gas is enclosed in a container closed by a tight fitting piston at its end. There is some friction between the piston and the walls of the container. Initially the gas is in the situation shown where the pressure of helium is equal to the atmospheric pressure. Now the gas is heated at a constant rate so that the piston starts moving at a point of time. Consider the process before this as process 1 and the process beyond this time till it reaches the stops as process 2.

TestHub · Accepted Answer

Process 1 Piston at rest ⇒ volume constant P V = n RT ⇒ P ∝ T ( V = co n s t ) Piston starts moving when: P g a s ​ A = P a t m ​ A + f ⇒ P g a s ​ = co n s t an t Process 2 P g a s ​ = co n s t an t P V = n RT ⇒ V ∝ T ( P = co n s t ) ⇒ i so ba r i c

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