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本通则适用于一般化工产品密度、相对密度的测定;不适用于炭黑和开孔式泡沫橡胶或塑料等特殊状态的化工产品密度、相对密度的测定。1 定义、单位与符号1.1 定义1.1.1 固体或液体的密度指在规定温度下单位体积物质的质量。1.1.2 固体或液体的相对密度指一定体积的物质在 t_1温度下的质量与等体积参考物质在 t_2温度下的质量之比,亦称密度之比
This General Regulation applies to the determination of the density and relative density of general chemical products. It is not applicable to the determination of the density and relative density of chemical products in special states such as carbon black and open-cell foam rubber or plastics. 1 Definitions, units and symbols 1.1 Definitions 1.1.1 Solid or liquid density refers to the mass per unit volume of material at a specified temperature. 1.1.2 The relative density of solids or liquids refers to the ratio of the mass of a volume of substance at t_1 temperature to the mass of an equal volume reference substance at temperature t_2, also known as the density ratio