Vacuum pump is a relatively sophisticated equipment, it's working medium is a special high boiling point, low-volatile oil pump, its effectiveness depends on the mechanical pump and pump oil quality.
真空油泵是一种比较精密的设备，它的工作介质是特制的高沸点、低挥发的泵油，它的效能取决于油泵的机械结构和泵油的质量。
The normal boiling point of a liquid is the special case at which the vapor pressure of the liquid equals the ambient atmospheric pressure.
常压沸点是一个特例，其中，液体的蒸汽压与环境大气压相等。
The ionic liquids have been proposed as working pairs of absorption cycle. They have several special characters, such as low vapor pressure, high boiling point and can been designed.
离子液体因具有“零”蒸气压、高热稳定性及可设计性等特点被提议作为吸收式循环的工质。
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