volatile fraction 挥发部分
volatile fraction determining 挥发分测定
volatile fraction in petroleum coke 石油焦挥发分
volatile fuel fraction 燃油的易挥发馏分
You decrease the mole fraction of the less volatile material in the gas phase.
更不易挥发的物质，在气相中的，摩尔分数减小了。
A volatile fraction of petroleum consisting chiefly of pentanes and hexanes.
主要由戊烷和己烷组成的一种挥发性石油馏分。
There is always a bottoms (or residue) fraction, which is the least volatile residue that has not been separately captured as a condensed vapor.
总有底部残留物（或残液）存在，这是挥发性最小的残液，没有被作为冷凝液而单独收集。
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