And in fact, what happens when this T becomes very large, when it tends to zero, when it tends to a very large number, when it tends to infinity, well, this becomes zero. And we see that at zero we get our Y intercept that is C.
And this equation shows the same exact thing. When T becomes a very large number, this whole number tends to zero. And so we simply get our log of our vapor pressure is equal to a constant C and we see exactly that on this graph. Another thing to realize is that the slope or the magnitude of the slope represents our change in enthalpy of vaporization. So for one liquid, this might be the slope for another liquid, say, if this was the slope for water, then alcohol would have a slope of this because alcohol has a smaller change in entry enthalpy of vaporization.