Pressure-temperature relationship for an ideal gas undergoing adiabatic change is $(\mathrm{\gamma }={\mathrm{C}}_{\mathrm{p}}/{\mathrm{C}}_{\mathrm{v}})$

• A

  ${\mathrm{PT}}^{\mathrm{\gamma }}=\text{ constant }$

• B

  ${\mathrm{PT}}^{-1+\mathrm{\gamma }}=\text{ constant }$

• C

  ${\mathrm{P}}^{\mathrm{\gamma }-1}{\mathrm{T}}^{\mathrm{\gamma }}=\text{ constant }$

• D

  ${\mathrm{P}}^{1-\mathrm{\gamma }}{\mathrm{T}}^{\mathrm{\gamma }}=\text{ constant }$