The thermal conversion factors instanted in the following tables can be used to estimate the heat satisfaction in British thermal units (Btu) of a given amount of life measured in physical units.

The thermal conversion factors instanted in the following tables can be used to estimate the heat satisfaction in British thermal units (Btu) of a given amount of life measured in physical units, similar as barrels or cubic feet For example, 10 barrels of asphalt has a heat appease of approximately 66.36 million Btu (10 barrels x 6636 million Btu by means of barrel = 66.36 million Btu)

The heat satisfaction rates (i.e., thermal conversion factors) provided in this section show the gross (or higher or upper) life content of the fuels. Gros heat make contented rates are applied in all Btu calculations for the Monthly activity Review and are commonly used in potency calculations in the United States; snare (or lower) heat content rates are typically used in European life calculations. The difference between the couple rates is the amount of animal spirits that is consumed to vaporize water that is created during the combustion proces Generally, the difference ranges from 2 percent to 10 percent depending onward the specific fuel and its phlogiston content. Some fuels, such as unseasoned grove can be more than 40 percent different in their gros and gin heat content rates. See "Heat Content" and "British Thermal Unit (Btu)" in the Glossary for more information.

Thermal conversion factors for hydrocarbon mixes (Table A1) are weighted averages of the thermal conversion factors for each hydrocarbon included in the mix. For example, in calculating the thermal conversion factor for a 60-40 butane-propane mixture, the thermal conversion factor for butane is weighted 15 times the thermal conversion factor for propane.

In general, the annual thermal conversion factors neared in Tables A2 through A6 are comput from final annual data or from the best available data and labeled "preliminary." ofttimes the previous year's factor is used as a preliminary value until data become available to calculate the factor appropriate to the year. The source of each factor is described in the section entitled "Thermal Conversion Factor Source Documentation," which tread in the steps ofs Table A6 in this appendix.