Relative humidity RH
Relative humidity is the ratio of the partial pressure of water vapor in an air-water mixture to the saturated vapor pressure of water at a prescribed temperature. The relative humidity of air depends on temperature and the pressure of the system of interest.
RH Relative humidity
mw mass of water vapor in the air(g/m3)
mw max Saturated water vapor amount(g/m3)
The unit of volume used as a standard is 1 m3.
The unit of weight of the water used as a standard is 1g.
When temperature changes, even when relative humidity is same, content amount of water changes.
◎Content amount of water which is 80% of relative humidity in case the temperature in equipment is 30℃
The above-mentioned formula is changed.
mw = mwmax X RH/100
mwmax = 30.4g
RH = 80%
mw = 30.4 x 80/100 = 24.32g/m3
◎ Content amount of water which is 80% of relative humidity in case the temperature in equipment is 60℃ similarly
mwmax = 129.9g
RH = 80%
mw = 129.9 x 80/100 = 103.92g/m3
◎ Content amount of water which is 80% of relative humidity in case the temperature in equipment is 90℃ similarly
mwmax = 421.5g
RH = 80%
mw = 421.5 x 80/100 = 337.2g/m3
<< Content water vapor content of 80% of relative humidity >>
That is, if temperature is raised to 90℃ from 30℃, maintaining 80% of relative humidity for equipment with 1-m capacity three, moisture of 312.88 g is absorbable from a subject at the maximum.
Related page:
2-6.Relationship of absolute humidity and the relative humidity 
2-5.Absolute humidity 
2-1.What is the humidity? 
2-3.Ask for saturation water vapor pressure 
2-2.There is a limit to the water vapor contained in the air 
2-8.The principle of the Psychrometer 
2-10.The Psychrometric charts 
2-11.Dew point and Dew point meter