First slide

Thermodynamic processes

Question

Air in a cylinder is suddenly compressed by a piston, which is then maintained at the same position. With the passage of time

Moderate

A

The pressure decreases
B

The pressure increases
C

The pressure remains the same
D

The pressure may increase or decrease depending upon the nature of the gas

Solution

Due to compression the temperature of the system increases to a very high value. This causes the flow of heat from system to the surroundings, thus decreasing the temperature. This decrease in temperature results in decrease in pressure.

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