# How do I calculate vapor pressure of water?

##### 1 Answer

You could use Antoine's equation to calculate the vapor pressure of water. Antoine's equation is a vapor pressure equation that describes the relationship between vapor pressure and temperature for pure components. So,

You'd get

This equation is usually used with two sets of paramaters, a low-pressure paramater that describes the vapor pressure curve up to the normal boiling point, and a second paramater that covers the range from boiling point to critical point.

So, for water, the two sets of paramaters are

**SET 1**.

**SET 2**.

Notice that you can use both sets of paramaters for temeperatures between

Here's a diagram of what an Antoine curve would look like