Why the measurement of Relative Humidity is dependent on temperature?
Whatever is the environnement, Relative Humidity is very sensitive to a change of temperature. The next tabloid illustrates this fact: Effect of a ±1 °C change on the measurement of Relative Humidity %HR 10°C 20°C 30°C 50°C 70°C 10% ± 0,7 ± 0,6 ± 0,6 ± 0,6 ± 0,5 50% ± 3,5 ± 3,2 ± 3,0 ± 2,6 ± 2,3 90% ± 6,7 ± 5,7 ± 5,4 ± 4,6 ± 4,1 That’s why an environment where the temperature is unstable causes an error in the measurement of Relative Humidity. A measurement of Relative Humidity must always be done with a measurement of temperature in steady environment. Relative Humidity increases when temperature decreases. On the contrary if temperature increases, Relative Humidity decreases.
