Calculating relative humidity



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
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