Can gas pressure and density be reduced without changing temperature?

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To maintain a constant temperature while reducing the pressure and density of a gas, one effective method is to increase the volume of the gas, which can be achieved using a cylinder with a moving piston. Placing the gas in a vacuum chamber larger than its original volume is another approach that allows for pressure reduction. It's important to ensure that thermal equilibrium is reached after any changes in volume or gas amount. These methods can successfully lower the pressure of argon gas at room temperature. Understanding the principles of gas laws is essential for these processes.
mishima
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I'm curious from a lab sort of perspective, how does one keep a gas at a constant temperature yet decrease both pressure and density? Like how could I reduce the pressure of argon gas with the gas kept at room temperature? Put it in a vacuum larger than the space it normally occupies or something? How is that constructed?
 
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Yes, you have to change the volume (or the amount of argon). Then you may have to wait for thermal equilibrium.
What about a cylinder with a moving piston?
 

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