hardwoodOne of the botanical groups of dicotyledonous trees that have broad leaves in contrast to the conifers or softwoods.
Heating ValueThe amount of heat produced from the complete combustion of a unit of fuel. The higher (or gross) heating value is that when all products of combustion…
hemicelluloseAny cellulose-like carbohydrate, but excluding cellulose itself. Together with pectin and lignin, hemicelluloses form the cell wall matrix.
herbaceous energy cropsPerennial non-woody crops that are harvested annually, though they may take two to three years to reach full productivity.
herbaceous plantsNon-woody species of vegetation, usually of low lignin content such as grasses.
hexoseAny of various simple sugars that have six carbon atoms per molecule (e.g. glucose, mannose, and galactose.)
Higher Heating Value (HHV)The maximum heating value of a fuel sample, which includes the calorific value of the fuel (bone dry) and the latent heat of vaporization of the water in…
holocelluloseThe total carbohydrate fraction of wood; cellulose plus hemicellulose.
HybridA class that is a mixture or combination of 2 or more classes. For example, a Druid can be viewed as a Warrior/Rogue/Priest hybrid.
HydrocarbonAny chemical compound containing hydrogen, oxygen, and carbon.
hydrocrackingA process in which hydrogen is added to organic molecules at high pressures and moderate temperatures; usually used as an adjunct to catalytic cracking.
hydrogenationTreatment of substances with hydrogen and suitable catalysts at high temperature and pressure to saturate double bonds.
HydrolysisA chemical reaction that uses water to break down a compound.