For Volatile matter we have terms and definitions in 2 topics. The topics are Energy and Natural Gas.

Those products, exclusive of moisture, given off by a material as gas or vapor. Volatile matter is determined by heating the coal to 950 degrees Centigrade under carefully controlled conditions and measuring the weight loss, excluding weight of moisture driven off at 105 degrees Centigrade.
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Matter which is readily vaporizable at a relatively low temperature.
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