# Isothermal Process

 For a constant temperature process involving an ideal gas, pressure can be expressed in terms of the volume:

The result of an isothermal heat engine process leading to expansion from Vi to Vf gives the work expression below.

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# Isothermal Process

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# Isothermal Process

For an ideal gas consisting of n = moles of gas, an isothermal process which involves expansion from

 Vi = m3
 to Vf = m3
 at temperature T = K

The work done in expanding the gas is

 = J = x10^ J

Applying the ideal gas law in the form shows that for this process

 = kPa = x10^ Pa
 = kPa = x10^ Pa
The temperature for the work calculation must be in Kelvins, so it must be converted from the other temperature scales.
 T = K = °C = °F
 Discussion of isothermal process
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