What is Calorific Value?

In gas, Calorific Value ("CV") is a measure of the energy contained within a gas and is dependent upon the composition of the gas. The CV is used to calculate the energy that may be released when a known volume of gas is completely combusted under specified conditions. It is a requirement to include CV on invoices and will be between 37 MJ/m3 and 43 MJ/m3.