Re: Calculating relative humidity
- From: sinkingcompany@xxxxxxxxxxx
- Date: 9 Dec 2005 18:47:10 -0800
Would a psychometric chart help you?
John_H wrote:
> 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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