If we graph it at three ATM, we also get a linear relationship. If we graph it at five at M, we also get a linear relationship. Now, at any other temperature, it would also show a linear relationship. Now, one thing can be seen from this graph is that at every single temperature, the graph is a set at exactly one point. And that one point is right here on the x axis. And we can define temperature to be zero Kelvin at this point.