Calculate the absolute humidity based on relative temperature in Celcius and relative humidity in percent.

abs_humid.py

#!/usr/bin/env python3

"""
Calculate the absolute humidity based on relative temperature in Celcius
and relative humidity in percent.

Based on:
https://carnotcycle.wordpress.com/2012/08/04/how-to-convert-relative-humidity-to-absolute-humidity/

Dry vs. Wet House based on Absolute Humidity:
https://www.youtube.com/watch?v=iiokj5gr4Jw&ab_channel=PeterWard
"""

import sys
import math

relT = float(sys.argv[1])
relH = float(sys.argv[2])

print("Relative Temperature " + str(relT) + " C")
print("Relative Humidity " + str(relH) + " %")

exponent = math.exp( (17.67*relT) / (relT + 243.5) )
absH = (6.112 * exponent * relH * 18.02) / ((273.15+relT)*100*0.08314)

print("Absolute Humidity " + str(absH) + " g/m^3")