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Author: [[user:Hschwarz|Hans-Jürgen Schwarz]] | Author: [[user:Hschwarz|Hans-Jürgen Schwarz]], NN | ||
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< | back to [[Physical Principles of Moisture|Physical Principles of Moisture]] | ||
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== Abstract == | |||
The equilibrium moisture content of a material is a function of the moisture content of the ambient air and temperature. It is defined by the maximum moisture a material can hold (saturation) at a certain relative humidity and temperature in order to be in equilibrium with its environment. | |||
Similar to the equilibrium moisture content of a salt, the equilibrium moisture content of a sample may be defined as follows: | |||
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| bgcolor="#ffff99" | ''' The equilibrium moisture content is the mass-related moisture content of a material, based on constant boundary conditions, which settles over time. '''<br> | |||
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The sample does not become wetter or dryer. It is thus clear, that the determination of equilibrium moisture content can be more important than the determination of the actual moisture content. In many materials the change in moisture causes expansion or contraction, which then causes damage. If the moisture of the ambient air differs from the equilibrium moisture it re-occurs through moisture uptake or release. The equilibrium moisture content of a sample decreases with temperature increase. |
Revision as of 22:43, 19 January 2013
Author: Hans-Jürgen Schwarz, NN
back to Physical Principles of Moisture
Abstract
The equilibrium moisture content of a material is a function of the moisture content of the ambient air and temperature. It is defined by the maximum moisture a material can hold (saturation) at a certain relative humidity and temperature in order to be in equilibrium with its environment.
Similar to the equilibrium moisture content of a salt, the equilibrium moisture content of a sample may be defined as follows:
The equilibrium moisture content is the mass-related moisture content of a material, based on constant boundary conditions, which settles over time. |
The sample does not become wetter or dryer. It is thus clear, that the determination of equilibrium moisture content can be more important than the determination of the actual moisture content. In many materials the change in moisture causes expansion or contraction, which then causes damage. If the moisture of the ambient air differs from the equilibrium moisture it re-occurs through moisture uptake or release. The equilibrium moisture content of a sample decreases with temperature increase.