Moisture content of a biomass is usually reported on wet weight basis as indicated by above equation. Since the moisture content of biomass varies from day to day due to variation in atmospheric relative humidity and temperature It is, therefore, preferable to report the biomass characteristic data on dry weight basis. At a relative humidity of 90 to 95%, the moisture content of most biomass ranges from 25 to 35%, which reduce to around 10% at a relative humidity of 30 to 40%. The moisture content on wet weight basis can be converted to dry weight basis using the expression given below. In the following equation M
w
and M
d
are the percent moisture content on wet and dry weight basis respectively