Isothermal Process

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

The result of a heat engine process leading to expansion from to 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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