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。
Distillation to separate volatile chemical substances in which the products are collected in a series of separate fractions, each with a higher boiling point than the previous fraction.
分离易挥发的化学物质的蒸馏法，其中生成物被收集在一系列单独的馏分里，每种馏分的沸点都比未分馏前高。
A volatile pressing oil HC-L200 was formulated with hydrotreated narrow fraction light base oil, fatty acid ester lubricant and additives, such as homemade wetting agent and compounded antirust agent.
根据铝翅片冲压加工工艺的技术特点，选用加氢精制窄馏分轻质油为基础油，添加特制的脂肪酸酯为油性剂以及自制的润湿剂和复合防锈剂等添加剂调合成HC - L 200挥发性冲压油。
A volatile pressing oil HC-L200 was formulated with hydrotreated narrow fraction light base oil, fatty acid ester lubricant and additives, such as homemade wetting agent and compounded antirust agent.
根据铝翅片冲压加工工艺的技术特点，选用加氢精制窄馏分轻质油为基础油，添加特制的脂肪酸酯为油性剂以及自制的润湿剂和复合防锈剂等添加剂调合成HC - L 200挥发性冲压油。
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