# How can you find the vapor pressure of a liquid?

And since vapour pressure is a function of temperature, there are usually tables that quote the vapour pressure of a given liquid at a given temperature. For water, the so-called $\text{saturated vapour pressure}$ is readily available. At $100$ ""^@C, ${P}_{\text{SVP}} = 1 \cdot a t m$. Why should this be so?