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Title: Determination Of Calorific Values Of Natural Gas By Combustion Instruments
Author: Robert Van Meter
Source: 1985 International School of Hydrocarbon Measurement
Year Published: 1985
Abstract: The British Thermal Unit or B.T.U. as defined by Websters Dictionary is the quantity of heat required to raise the temperature of one pound of water one degree Fahrenheit at or near 39.2F.l Early calorimeters actually utilized a known quantity of water, water temperature measurement by thermometer and burned a measurement quantity of gas. The temperature rise of the water, if one pound of water was used, divided by the number of cubic feet of gas burned will yield the number of B.T.U. per cubic foot of the gas burned. This type of instrument is still used in some laboratories. It does not lend itself to online use, however, because it requires people on sight to take temperature readings, change water, etc.

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