Product guide

Humidity and Dew-Point Instruments
© Michell Instruments 2009-2011
72
Temperature
Increase
Temperature
Decrease
Pressure
Increase
Pressure
Decrease
Vapor
Increase
Vapor
Decrease
% RH
  
Dew Point
     
Absolute Humidity
     
Mix Ratio
     
Concentration of Water Vapor
     
In nature, water exists in three different states: gaseous
(vapor), liquid (rain, fog) and solid (snow, ice, hail). Water in
the gaseous state is invisible. The maximum quantity of water
vapor that the air can contain depends on temperature and
pressure. The table below shows how the parameter change
infl uences the measured values.
Relative humidity is the ratio of the actual quantity of water
vapor that an air sample contains to the maximum quantity
of water vapor that such a sample can contain at the sample
pressure and temperature.
Effects of pressure, temperature and
concentration on humidity
parameters