1.1 本试验方法包括测量透明牛顿液体的运动粘度，由于其反应性、不稳定性或挥发性，这些液体不能用于传统毛细管运动粘度计。此测试方法最多适用于2 × 10 −5 N/m 2. （2 atm）压力和温度范围为−53 °C至+135 °C（−65 °F至+275 °F）。 1.1.1 有关其他液体运动粘度的测量，请参见试验方法 D445 这两种方法的区别在于粘度计。 所用规范中规定的粘度计 D446 对大气开放，而这种方法中的粘度计是密封的。当在密封粘度计中测量挥发性液体时，与液体的密度相比，蒸汽的密度可能不可忽略，粘度计的工作方程必须考虑到这一点。请参阅第节 11 详细信息。 1.2 警告 --汞已被许多监管机构指定为一种可能导致严重医疗问题的危险物质。 汞或其蒸汽已被证明对健康有害，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）。当地或国家法律有可能禁止销售汞或含汞产品，或两者兼而有之。用户必须确定在其所在地销售的合法性。 1.3 本标准并不旨在解决与其使用相关的所有安全问题（如有）。 本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 有关具体的警告语句，请参阅 7.2 ， 7.3 ， 7.4 和 附件A1 。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 运动粘度是一种物理性质，在使用或处理流动液体的系统设计中具有重要意义。

1.1 This test method covers the measurement of kinematic viscosity of transparent, Newtonian liquids which because of their reactivity, instability, or volatility cannot be used in conventional capillary kinematic viscometers. This test method is applicable up to 2 × 10 −5 N/m 2 (2 atm) pressure and temperature range from −53 °C to +135 °C (−65 °F to +275 °F). 1.1.1 For the measurement of the kinematic viscosity of other liquids, see Test Method D445 . The difference between the two methods is in the viscometers. The viscometers specified in used Specification D446 are open to the atmosphere, while the viscometers in this method are sealed. When volatile liquids are measured in sealed viscometers, the density of the vapor may not be negligible compared with the density of the liquid and the working equation of the viscometer has to account for that. See Section 11 for details. 1.2 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. 1.3 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 of regulatory limitations prior to use. For specific warning statements, see 7.2 , 7.3 , 7.4 , and Annex A1 . 1.4 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 Kinematic viscosity is a physical property which is of importance in the design of systems in which flowing liquids are used or handled.