# What is the tempeature to which air must be cooled at a constant pressure to become saturated?

Feb 2, 2017

$\text{Saturated}$ with what, water vapour?

#### Explanation:

The $\text{saturated vapour pressure}$ is the vapour pressure of water at a given temperature. When a gas is collected over water, one must always account for ${P}_{\text{SVP}}$ at the specified temperature;

i.e. ${P}_{\text{observed}}$ $=$ ${P}_{\text{gas"+P_"SVP}}$

${P}_{\text{SVP}}$ is a function of temperature; at laboratory temperatures ${P}_{\text{SVP}} \cong 20 \cdot m m \cdot H g$.

How would you predict ${P}_{\text{SVP}}$ to evolve with increasing temperature?