Re: Calculating relative humidity

Elekaj wrote:
>
>For mesuring humidty, I have two digitals thermometers. One is mesuring
>the ambient air temperature and the second mesures the temperature of a
>wet cotton (which is in contact with the ambient air).
>
>In addition, I have a digital pressure sensor.
>
>But my problem is that I don't know the formula to calculate the
>relative humidity from dry temperature, wet temperature and pressure.
>
>Someone know this formula ?

There is no empirical formula to calculate relative humidity from
temperature and wet bulb depression. You'd need to measure dew point
to enable a calculation..

AFAIK the humidity tables based on wet bulb depression have been
derived entirely from observation.

--
John H
.

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