- fractional composition of petroleum
- 石油馏分组成
English-Chinese chemistry dictionary (英汉化学大词典). 2013.
fractional composition of petroleum
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Fractional distillation — is the separation of a mixture into its component parts, or fractions, such as in separating chemical compounds by their boiling point by heating them to a temperature at which several fractions of the compound will evaporate. It is a special… … Wikipedia
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chemical element — Introduction also called element, any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is composed. This article considers the… … Universalium
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