# Talk:Units for Moisture Measurement

Author: Hans-Jürgen Schwarz

back to Moisture Maybe rather Material Moisture Content?

## Key parameters

Commonly used parameters are:

• Mass related moisture content
• Volume related moisture content
• Saturation humidity: maximum capillary moisture content /absorption at atmospheric pressure or vacuum (by immersion)
• Equilibrium moisture content: moisture absorption due to hygroscopicity
• Maximum degree of pore filling
• Hygroscopicity related degree of pore filling

 Parameter Equation Explanation Mass related material moisture contentum in [M%] $\displaystyle u_m=\frac{m_W}{m_T}\cdot 100=\frac{m_F-m_T}{m_T}\cdot 100$ mW = Mass of water sorbed by the sample in [g]mF = Mass of the humid sample in [g] at sample collection mT = Mass of the dry sample in [g] (from the moment of drying up to a constant weight) Volume related material moisture contentuv in [Vol%] $\displaystyle u_V=\frac{V_W}{V_T}\cdot 100=u_m \cdot\frac{\rho_T}{\rho_W}$ VW = Volume of the water sorbed by the sample in [cm³]VT = Volume of the dry sample at sample collection in [cm³] um = Mass related moisture content in [M.%]$\displaystyle \rho$ T = Density of the dry sample in [g/cm³]$\displaystyle \rho$ W = Density of the water in [g/cm³] Saturation humidity of a materialus in [M%] $\displaystyle u_S=\frac{m_F_S-m_T}{m_T}\cdot 100$ mFS = Mass of the moisture saturated sample [g]mT = Mass of the dry sample in [g] Hygroscopicity related equilibrium moisture content of a materialuA in [M%] $\displaystyle u_A=\frac{m_F_A-m_T}{m_T}\cdot 100$ mFA = Mass of a sample after hygroscopic moisture absorptionmT = Mass of the dry sample in [g] Total degree of pore filling PFGG in [M%] $\displaystyle PFG_G=\frac{u_m}{u_S}\cdot 100$ um = Mass related moisture content in M.%us = Saturation humidity in [M%] Hygroscopicity related degree of pore fillingPFGH in [M%] $\displaystyle PFG_H=\frac{u_A}{u_S}\cdot 100$ ] uA = Hygroscopicity related equilibrium moisture content in M.%us = Saturation moisture content in [M%]

--SLeithaeuser 21:59, 27 January 2013 (CET)