A cylinder with a piston contains an ideal gas, as shown. A valve is opened allowing the gas to escape slowly. When the valve is closed you observe that the piston is in a lower position. Assume the gas is in thermal equilibrium with its surroundings at all times. (a) is the final pressure of the gas in the cylinder greater then, less than, or the same as the initial pressure?

Principles of Physics: A Calculus-Based Text
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Chapter17: Energy In Thermal Processes: The First Law Of Thermodynamics
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A cylinder with a piston contains an ideal gas, as shown. A valve is opened allowing the gas to escape slowly. When the valve is closed you observe that the piston is in a lower position. Assume the gas is in thermal equilibrium with its surroundings at all times.
(a) is the final pressure of the gas in the cylinder greater then, less than, or the same as the initial pressure?
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