Definition of humidity by psychrometer

Definition of absolute and relative humidity of air station by psychrometer August (a) and Assman (b) (fig. 1).

The tank of psychrometer full with water. A fabric which the tank of one of device thermometers is wrapped up, lower in water so that the tank was on distance of 3 sm over a water surface. Then psychrometer is suspend on a support in the definition point. In 8-10 minutes remove indicators of dry and damp thermometers.

Relative humidity defined by psychrometer of any type, see on the table 1 (at the speed of air movement 0.2 m/s). Its values find in a point of crossing of indicators of dry and damp thermometers.

The work principle of psychrometer is based on the intensity of evaporation of the moisture to surface of the humidified tank of psychrometer, which is proportional to dryness of air: the more low indicators of the humidified thermometer compared with dry because warmly humidified psychrometer is lost on latent heat of steam formation.

Fig. 1. Devices for definition of humidity of air

(a - psychrometer August; - psychrometer Аssman; b- hyhrometer)

Тable 2

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