For a fixed pass of a gas at constant volume ,draw `p-t^@C` and `p-TK`graphs. How can the value of absolute zero be obtained from the 1st graph?

Explanation

The graphs are shown in fig6.12 and 6.13 respectively for 3 different volumes.

The graphs are straight lines in nature.
In the `p-t^@C` graph [Fig.6.12] the three lines correponding to the three volumes ,converge at a point on the negative t axis,where pressure is zero. the point gives the value of absolute zero as per definition. In the `p-T K` graph [Fig.6.13] the three straight lines pass through the origin, showing p=0 when T=0.