1.1 本试验方法涵盖了转换通过试验方法获得的数据的计算程序 D972 表观蒸汽压和分子量。已证明适用于石油基和合成酯润滑油， 2. 温度为395 K至535 K（250 °F至500 °F）。然而，其对润滑脂的适用性尚未确定。 注1: 大多数润滑剂在相当宽的温度范围内沸腾，这是在讨论其蒸汽压时认识到的一个事实。例如，表观蒸汽压在0范围内 % 到0。 1. % 蒸发量可能是4.9范围内的100倍 % 至5.0 % 蒸发了。 1.2 以国际单位制表示的数值应视为标准。如果材料、产品或设备仅以英寸-磅为单位，则省略国际单位。 1.3 警告 -许多监管机构已将汞指定为一种危险物质，可导致严重的医疗问题。汞或其蒸汽已被证明对健康有害，并对材料具有腐蚀性。处理汞和含汞产品时要小心。 有关更多信息，请参阅适用的产品安全数据表（SDS）。当地或国家法律禁止销售汞或含汞产品，或两者兼有。用户必须确定其所在地销售的合法性。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定适用性或监管限制。 有关特定警告声明，请参阅 6.2 , 7.1 , 8.2 和 附件A2 . 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 通过蒸发测量确定的物质蒸汽压反映了散装样品的特性。该程序对低浓度挥发性杂质的存在几乎没有影响。 5.2 蒸汽压， 本身 ，是一种热力学性质，仅取决于稳定系统的组成和温度。在本方法中，成分在试验过程中发生变化，从而将少量挥发性杂质的贡献降至最低。

1.1 This test method covers a calculation procedure for converting data obtained by Test Method D972 to apparent vapor pressures and molecular weights. It has been demonstrated to be applicable to petroleum-based and synthetic ester lubricating oils, 2 at temperatures of 395 K to 535 K (250 °F to 500 °F). However, its applicability to lubricating greases has not been established. Note 1: Most lubricants boil over a fairly wide temperature range, a fact recognized in discussion of their vapor pressures. For example, the apparent vapor pressure over the range 0 % to 0.1 % evaporated may be as much as 100 times that over the range 4.9 % to 5.0 % evaporated. 1.2 The values stated in SI units are to be regarded as the standard. In cases in which materials, products, or equipment are available in inch-pound units only, SI units are omitted. 1.3 WARNING —Mercury has been designated by many regulatory agencies as a hazardous substance that can cause serious medical issues. Mercury, or its vapor, has been demonstrated to be hazardous to health and corrosive to materials. Use caution when handling mercury and mercury-containing products. See the applicable product Safety Data Sheet (SDS) for additional information. The potential exists that selling mercury or mercury-containing products, or both, is prohibited by local or national law. Users must determine legality of sales in their location. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability or regulatory limitations prior to use. For specific warning statements, see 6.2 , 7.1 , 8.2 , and Annex A2 . 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 The vapor pressure of a substance as determined by measurement of evaporation reflects a property of the bulk sample. Little weight is given by the procedure to the presence of low concentrations of volatile impurities. 5.2 Vapor pressure, per se , is a thermodynamic property that is dependent only upon composition and temperature for stable systems. In the present method, composition changes occur during the course of the test so that the contribution of minor amounts of volatile impurities is minimized.