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- Thread starter Mohankpvk
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- #2

Chestermiller

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Why don't you precisely define a focus problem that we can work on together to help you get an understanding of these issues?

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Let us consider a frictionless piston cylinder arrangement containing an ideal gas.Initially the gas(system) inside the arrangement is at atmospheric pressure.The surrounding is the atmosphere.So the piston is at rest.If we heat the cylinder(by placing it in contact with a slightly higher temperature source(infinitesimal temperature difference), can the gas expand isothermally?(If so, please tell me whether the pressure of the gas increases or decreases during expansion and whether the final system pressure value will be higher or lower than the initial value after attaining equilibrium(the piston comes to rest))Why don't you precisely define a focus problem that we can work on together to help you get an understanding of these issues?

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Chestermiller

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is the cylinder horizontal or vertical? If the cylinder is vertical, does the piston have mass, or is it massless?Let us consider a frictionless piston cylinder arrangement containing an ideal gas.Initially the gas(system) inside the arrangement is at atmospheric pressure.The surrounding is the atmosphere.So the piston is at rest.If we heat the cylinder(by placing it in contact with a slightly higher temperature source(infinitesimal temperature difference), can the gas expand isothermally?(If so, please tell me whether the pressure of the gas increases or decreases during expansion and whether the final system pressure value will be higher or lower than the initial value after attaining equilibrium(the piston comes to rest))

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The piston doesn't have any mass.So I think there will not be any difference between the two orientations.is the cylinder horizontal or vertical? If the cylinder is vertical, does the piston have mass, or is it massless?

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Chestermiller

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Thank you.So this means the process cannot be isothermal (i.e. if the initial system and surrounding pressures(before expansion) are equal, the process cannot be an isothermal expansion)I am not really sure whether my inference is right.Please comment on it.

- #8

Chestermiller

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There are two ways to get the gas to expand: (a) increase the outside temperature or (b) decrease the outside pressure. Or you can use combinations of outside pressure and temperature changes, if, at the final state, the volume (calculated from the ideal gas law) is greater than the initial volume.Thank you.So this means the process cannot be isothermal (i.e. if the initial system and surrounding pressures(before expansion) are equal, the process cannot be an isothermal expansion)I am not really sure whether my inference is right.Please comment on it.

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