3 types of Humidity
Relative Humidity Absolute Humidity Dew point
Relative Humidity can be defined as the the actual quantity of water vapor present in a given space expressed as a percentage of the quantity of water vapor that would be present in the same space under saturated conditions at the existing temperature
Absolute humidity can be defined as mass of vapor per unit mass of dry gas
Dew point can be defined as the saturation temperature of the mixture at the corresponding pressure.
Methods used to measure humidity Relative Humidity Measurement 1.Mechanical 2.Wet and dry bulb thermometers 3.Surface resistivity devices 4.Crystal frequency change
Absolute Moisture Measurement 1.Gravimetry 2.Electrolysis 3.Infrared 4.Conductivity 5.Capacitance
Dew point measurement 1.Chilled mirror 2.Lithium Chloride 3.Wet bulb thermometer