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Outrageous
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In that experiment , the internal energy is zero , volume increase , pressure of system decrease, then temperature will constant ?
Thanks
Thanks
greswd said:Nope, not guaranteed. The expansion can also be adiabatic, or heat can even be loss while work is done by the gas.
Only an isothermal expansion guarantees no change in internal energy.
Outrageous said:Then when it expand to vacuum?
No work will be done because the external pressure is zero.
Internal energy will not change as no heat enter, no work done
Will the temperature change ?
Joule free adiabatic expansion is a process in thermodynamics where the temperature remains constant during expansion, meaning there is no exchange of heat with the surroundings. This process is also known as isothermal expansion.
In joule free adiabatic expansion, there is no change in temperature, whereas in other types of expansions, such as isobaric or isochoric, the temperature can change.
The equation for joule free adiabatic expansion is dT=0, which means that the change in temperature is equal to zero.
A common example of joule free adiabatic expansion is the expansion of a gas in a piston without any heat transfer. Another example is the cooling of a gas as it expands through a small hole, such as in a can of compressed air.
Joule free adiabatic expansion is important in thermodynamics because it allows for the study of systems where heat transfer is not present. This can help in understanding the behavior of gases and other substances in various processes, such as in engines or refrigeration systems.