1.1本规程包括通过成分分析近似测定商用丙烷和特殊用途丙烷（规范D 1835涵盖）的以下物理特性:蒸汽压、相对密度和发动机辛烷值（MON）。 1.2本规程不适用于任何超过非挥发性残留物规范的产品。（见试验方法D 2158。） 1.3为了计算发动机辛烷值，本规程仅适用于丙烯含量小于等于20%的混合物。 1.4对于方法中计算的发动机辛烷值，本规程基于仅包含表1所示成分的混合物。 1.5以国际单位制表示的数值应视为标准。 括号中给出的值仅供参考。

1.1 This practice covers, by compositional analysis, the approximate determination of the following physical characteristics of commercial propane and special-duty propane (covered by Specification D 1835): vapor pressure, relative density, and motor octane number (MON). 1.2 This practice is not applicable to any product exceeding specifications for nonvolatile residues. (See Test Method D 2158.) 1.3 For calculating motor octane number, this practice is applicable only to mixtures containing 20 % or less of propene. 1.4 For calculated motor octane number in method, this practice is based on mixtures containing only components shown in Table 1. 1.5 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.