Air in a cylinder is suddenly compressed by a piston, which is then maintained at the same position. With the passage of time
(1) The pressure decreases
(2) The pressure increases
(3) The pressure remains the same
(4) The pressure may increase or decrease depending upon the nature of the gas
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(1) 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.