Now, this is exactly what the closest Clayton relation does. These were two scientists who developed mathematically and the experimental result, this relationship where this is our y value, this is our slope, this is our X value, and this is our Y intercept. This is the natural log of vapor pressure of our liquid. This, our slope, is the negative of the change in enthalpy about vaporization of the liquid over our gas constant R. Our X value is one over t or one over temperature of the liquid. And this is a constant that depends on the liquid being used. And if you graph this, you get exactly a linear line that has a negative slope shown by this negative sign here.