Equilibrium moisture content
![Equilibrium moisture content of wood versus humidity and temperature, according to the Hailwood-Horrobin equation.](/Images/godic/202501/11/Hailwood-Horrobin_EMC_graph.svg5639.png")
The moisture content of wood below the fibre saturation point is a function of both relative humidity and temperature of surrounding air. The equilibrium moisture content (EMC) is the moisture content at which the wood is neither gaining nor losing moisture; this however, is a dynamic equilibrium and changes with relative humidity and temperature.