1.1 本试验方法涵盖并规定了同时测量透明和不透明液体石油产品和原油的动态粘度η和密度ρ的程序。运动粘度ν可以通过将动态粘度η除以在相同试验温度下获得的密度ρ来获得。 1.2 从该试验方法中获得的结果取决于样品的行为，并适用于剪切应力和剪切速率主要成比例的液体（牛顿流动行为）。 1.3 精度仅针对第节中所示的材料、粘度范围、密度范围和温度确定 15 关于精度和偏差。该测试方法适用于更广泛的材料、粘度、密度和温度范围。 对于第节中未列出的材料 15 关于精度和偏差，精度和偏差可能不适用。 1.4 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.5 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制定适当的安全、健康和环境实践，并在使用前确定监管限制的适用性。 1.6 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 许多石油产品和一些非石油材料用作润滑剂，设备的正确操作取决于所用液体的适当粘度。此外，许多石油燃料的粘度对于估计最佳储存、处理和操作条件很重要。因此，粘度的准确测定对于许多产品规格至关重要。 5.2 密度是一种基本的物理性质，可与其他性质一起用于表征石油和石油产品的轻馏分和重馏分。 5.3 在15℃的标准温度下，需要测定石油及其产品的密度或相对密度，以将测量体积转换为体积 °C。

1.1 This test method covers and specifies a procedure for the concurrent measurement of both the dynamic viscosity, η, and the density, ρ, of liquid petroleum products and crude oils, both transparent and opaque. The kinematic viscosity, ν, can be obtained by dividing the dynamic viscosity, η, by the density, ρ, obtained at the same test temperature. 1.2 The result obtained from this test method is dependent upon the behavior of the sample and is intended for application to liquids for which primarily the shear stress and shear rate are proportional (Newtonian flow behavior). 1.3 The precision has only been determined for those materials, viscosity ranges, density ranges, and temperatures as indicated in Section 15 on Precision and Bias. The test method can be applied to a wider range of materials, viscosity, density, and temperature. For materials not listed in Section 15 on Precision and Bias, the precision and bias may not be applicable. 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 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 to determine the applicability of regulatory limitations prior to use. 1.6 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 Many petroleum products, and some non-petroleum materials, are used as lubricants and the correct operation of the equipment depends upon the appropriate viscosity of the liquid being used. In addition, the viscosity of many petroleum fuels is important for the estimation of optimum storage, handling, and operational conditions. Thus, the accurate determination of viscosity is essential to many product specifications. 5.2 Density is a fundamental physical property that can be used in conjunction with other properties to characterize both the light and heavy fractions of petroleum and petroleum products. 5.3 Determination of the density or relative density of petroleum and its products is necessary for the conversion of measured volumes to volumes at the standard temperature of 15 °C.