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The compression of air in a jet turbine is often approximated as an adiabatic process.

The governing equation is pv^(gamma) is constant in an adiabatic process. Gamma is the ratio Cp/Cv, where Cp is the specific heat for a constant pressure process and Cv is the specific heat for a constant volume process. Combining this with the ideal gas law you can derive the temperature-pressure relationship

T2/T1 = (p2/p1)^(kappa)

where kappa = (gamma-1)/gamma.

Keep in mind that everything has to be in absolute units (e.g. temperature in kelvins and pressure in Pa,absolute.)

For a diatomic gas, gamma=1.4, so kappa=0.286.

Therefore, the final temperature is

T2=T1*(p2/p1)^(kappa)

=213 K * (1000/250)^0.286

= 213 * 1.48658

= 316.6 K.

This is the ideal case. For engineering calculations a lower value of gamma is sometimes used (say 1.3).

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