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7. Product types
Product type Definition Unit Measuring range
absolute Hu-
midity
absolute air humidity
g/m³
0 to 130 g/m³
Dew Point Dew Point
°C
°F
-55 °C to +60 °C
-67 °F to 140 °F
relativ Humidity relative air humidity % RH 0 to 100 %
EMC Wood Wood equilibrium moisture content
%
EMC.
2 to 30 %
(wood moisture)
EMC POM POM equilibrium moisture content
%
EMC.
0 to 2 %
Water
Activity
water activity aw 0 to 1
Empty 1 - 5 Free curve for special products
7.1 Definition product types
Absolute humidity
The absolute air humidity shows the contained amount of water in gramme per cubic
metre of air. The absolute humidity is a direct degree for the amount of water vapour
contained in a certain air volume. It shows how much condensate can precipitate or
how much water has to be evaporated in order to obtain the desired humidity.
Dew Point
The dew point is the temperature to which the air that is not completely saturated with
water vapour must be cooled so that it is completely saturated. When a room with the
current relative humidity cools down to the dew point temperature, the water vapour
begins to condense.
Relative humidity
Indicates the relationship between the current water vapour pressure and the maxi-
mum possible, the so-called saturation vapour pressure.
The relative humidity shows the degree the air is saturated with water vapour.
Examples:
50% relative humidity: At the current temperature and pressure, the air is half satura-
ted with water vapour. 100% relative humidity means that the air is totally saturated
with water vapour. If the air has more than 100% humidity, the excessive humidity
would condense or precipitate as mist.
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