# Absolute humidity

1. Feb 13, 2007

### Orbital

1. The problem statement, all variables and given/known data
Estimate the mass of water vapor that is contained in $1 m^3$ of saturated air at a temperature of plus 20 degrees Celsius

2. The attempt at a solution
I looked up the saturation pressure for water vapor at the given temperature. Can I just use the ideal gas-law for the mass? i.e. is the solution as simple as
$$m_{H_2O} = \frac{P_{sat, H_2O}}{R_{H_2O}T}$$
or do I have to make another approach?

2. Feb 13, 2007

### lalbatros

yes this looks right, but -as usual- be careful with the units

Last edited: Feb 13, 2007
3. Feb 13, 2007

### Orbital

Can you tell me why the phrasing of the problem is physically incorrect?