A fixed mass of an ideal gas is maintained at constant volume the pressure of the gas at triple point of water is ptr then thermodynamic temperature of the gas when the pressure is P

• A

  $273.16\left(\frac{\mathrm{P}}{{\mathrm{P}}_{\mathrm{tr}}}\right)\mathrm{K}$

• B

  $273.16\left(\frac{\mathrm{P}-{\mathrm{P}}_{\mathrm{t}}}{{\mathrm{P}}_{\mathrm{t}}}\right)\mathrm{K}$

• C

  $273.16\left(\frac{{\mathrm{P}}_{\mathrm{tr}}}{\mathrm{P}}\right)\mathrm{K}$

• D

  $273.16\left(\frac{\mathrm{P}+{\mathrm{P}}_{\mathrm{t}}}{\mathrm{P}}\right)\mathrm{K}$