n. The amount of heat energy required to raise a unit mass of a substance one degree in temperature.
Commonly, specific heat is specified by mass; for example, water has a mass-specific heat capacity of approximately 4.184 joules per gram per degree Kelvin. Volume-specific and molar-specific heat capacities are also used. Specific heat is an intensive quantity, meaning it is a property of the material itself and not the size or shape of the sample. Its value is affected by the microscopic structure of the material.
The heat capacity of wood depends on the temperature and moisture content of the wood but is practically independent of density or species (Simpson and TenWolde 1999). Heat capacity of dry wood ranges from 1.34 kJ g-1•K-1 to 2.01 kJ g-1•K-1. The heat capacity of wood that contains water is greater than that of dry wood. Below fiber saturation, it is the sum of the heat capacity of the dry wood and that of water and an additional adjustment factor that accounts for the additional energy in the wood–water bond. The moisture above fiber saturation contributes to specific heat according to the simple rule of mixtures.