find the reason of the following....
in a closed vessel the pressure of gas increase and decrease with volume
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In a closed vessel, the pressure of a gas increases and decreases with volume as it follows the Boyle's law.
According to the Boyle's law, the pressure of a given mass of an ideal gas is inversely proportional to its volume at a constant temperature.
On decreasing the volume of a gas, the pressure of the gas within the vessel is found to increase. It is because the particles will now suffer more collision with the walls of the vessel and everytime a force is exerted on them. Under such circumstances, the pressure will increase.
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