I am trying to find a way to calculate the water vapor present in air in cm. The data I have available is Relative Humidity, Ambient Temperature and Atmospheric Pressure.
Relative humidity (RH) - The ratio of the actual amount of water vapor in the air to the amount it could hold when saturated is expressed as a percentage, or the ratio of the actual vapor pressure to the saturation vapor pressure is expressed as a percentage.
I used this (https://planetcalc.com/2161/) information to calculate saturation vapor pressure, then I can use humidity and saturation vapor pressure, to get actual vapor pressure. I can not figure out from actual vapor pressure how can I get water vapor in cm or can I even get water vapor in cm?
It important for me to have it in cm. Please help me how can I calculate water vapor?
P cm Hg = 0.0073555 × P mm H2O
Standard atmospheric pressure is 760 mm Hg = 76 cm Hg.
P mm H20 = P cm Hg/0.0073555
P cm H20 = P mm H20/10
The amount of water vapor present in air (Absolute Humidity) is not expressed in centimetres, it is usually expressed in g/m3. The Planetcalc Relative humidity to absolute humidity calculator (https://planetcalc.com/2167/) may be what you are looking for. Note that this calculator generates values in kg/m3 (It also incorrectly uses centigrade instead of degrees Celsius). This value can be easily converted into g/cm3 by dividing by 103, e.g. 0.010 kg/m3 equals 0.000 01 g/cm3.
Rai Pippia
Thank you for your reply.
Sorry I meant how can I calculate precipitable water vapor in cm, given that I have the following information available;
Relative Humidity,
Ambient Temperature
Atmospheric Pressure.
And I thought degrees centigrade is the same as degrees celsius (https://www.unitconverters.net/temperature-interval/degree-centigrade-to-degree-celsius.htm)