In case of constant volume process, i.e., isochoric process,
From ideal gas equation,
TP=nVR=constant
Or we have, P=VnR(t+273)
If P=0⇒t=−273∘C
Thus, when temperature goes to −273∘C, all constituent particles get freezed and pressure goes to zero irrespective of the density of gas.
Hence, the temperature corresponding to the point K=−273∘C.
