Re: Calculating relative humidity

David Moran wrote:
"Elekaj" <elekaj34@xxxxxxx> wrote in message news:4399becd$0$4335$626a54ce@xxxxxxxxxxxxxxx

Hi

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 ?

Thank you very much

Alain 


Do a google search on the Clausius-Clapeyron Equation and Relative Humidity.

Dave 



Does Clausius-Clapeyron work with wetbulb?  I've only
ever used it with dewpoint.

Back when I took obs at the PSU Wx Tower, we slung the
psychrometer to get wetbulb and then used "The Magic
Wheel" to figure out RH given the dry and wetbulbs.


Scott
.

Relevant Pages

  • [Summary] May 2006 Bracknell (Tawfield)
    ... equal second-warmest mean night minima in that record. ... Although it has been a wet month, given the final total, in the ... Other figures via the link below (East Berkshire Weather), ...
    (uk.sci.weather)
  • Re: Penzance - Cool & Wet
    ... It has been a very wet afternoon, but the rainfall rate has never been ... This afternoon's rain was plain to see on the radar ... afternoon here temperature since May) were not even hinted at. ...
    (uk.sci.weather)
  • Re: Calculating relative humidity
    ... For mesuring humidty, ... One is mesuring the ambient air temperature and the second mesures the temperature of a wet cotton. ...
    (sci.geo.meteorology)
  • Re: Calculating relative humidity
    ... I have two digitals thermometers. ... >the ambient air temperature and the second mesures the temperature of a ... >wet cotton (which is in contact with the ambient air). ... wet temperature and pressure. ...
    (sci.geo.meteorology)
  • Re: {WR} Haytor 16/5/08 (Fog and more fog)
    ... shrubs drooping under the weight of ... Everywhere is dripping wet, plants are drooping and walking round the ... For the past 20 hours the temperature has been between 9.6 and 9.8C, ...
    (uk.sci.weather)