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Humidity and Dew-Point Instruments

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

1 2 ... 68 69 70 71 72 73 74 75 76 77 78 ... 99 100

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