Gas Chromatographs have become vitally important in today’s gas industry for one very important reason. The reason is they provide the data that tells us how much energy in contained in a given sample of gas. With the escalating costs of natural gas, the capability of calculating the full energy of the gas sample has also increased in value. Currently, gas is exchanged based on the amount of energy contained in natural gas, not just the volume of that gas. The energy of a given gas quantity is derived by multiplying the gas volume by the quality or Btu value of the gas. The energy value is called a deka Therm or MM Btu