Hi,

with the formula Av = (Rv * 1325,3 * 10^(7,5892 * T / (T+240,71)))/(T+273,15)

it should be possible to calculate the absolute humidity.

RV = relative humidity
T = temperature in degrees.

As you see, lots of huge numbers, comma's and even an
exponentiation

Is a wizkid out there how knows to calculate this in PBP3? I'm using a PIC16F1936

Many thanks