Pressure-temperature relationship for an ideal gas undergoing adiabatic change is \[(\gamma ={{C}_{p}}/{{C}_{v}})\] [CPMT 1992; MP PMT 1986, 87, 94, 97; Pb. PET 1998; DCE 2001; MP PET 2001; UPSEAT 1999, 2001; AFMC 2002]

• A.   \[P{{T}^{\gamma }}=\] constant 
• B.   \[P{{T}^{-1+\gamma }}=\]constant
• C.   \[{{P}^{\gamma -1}}{{T}^{\gamma }}=\]constant    
• D.   \[{{P}^{1-\gamma }}{{T}^{\gamma }}=\]constant