气体分析 气体混合物成分数据的转换

[中文适用范围]： 本文件定义了用于表达气体混合物组成的常用量： — 数量分数和浓度； — 质量分数和浓度； — 体积分数和浓度。 对于这些组成量，本文件规定了以下方法： — 不同量之间的转换； — 不同状态条件之间的转换。 不同量之间的转换是指在相同压力和温度条件下，根据上述列出的量之一的值，计算相同含量的值。不同状态条件之间的转换是指在不同的状态条件下，根据上述列出的量之一的值，计算相同含量的值。 本文件仅适用于均质和稳定的气体混合物。因此，任何考虑的状态条件（压力和温度）都需要远离气体混合物的冷凝区域。此外，体积浓度只能在所考虑的组分完全气态的情况下使用，而体积分数的使用需要所有组分完全气态。 [外文原描述]： This document defines the following quantities commonly used to express the composition of gas mixtures: — amount fraction and concentration; — mass fraction and concentration; — volume fraction and concentration. For these quantities of composition, this document specifies methods for: — conversion between different quantities; — conversion between different state conditions. Conversion between different quantities means calculating the value of the content of a specified component in terms of one of the quantities listed above from the value of the same content, at the same pressure and temperature of the gas mixture, given in terms of another of these quantities. Conversion between different state conditions means calculating the value of the content of a specified component, in terms of one of the quantities listed above, under one set of state conditions from the value of the same quantity under another set of state conditions, i.e., pressure and temperature, of the gas mixture. Gas mixture composition can be converted simultaneously between different quantities of composition and different state conditions by combination of the two types of conversion. This document is applicable only to homogeneous and stable gas mixtures. Therefore, any state conditions (pressure and temperature) considered need to be well outside the condensation region of the gas mixture. In addition, volume concentrations can only be used if the component under consideration is completely gaseous, and for the use of volume fractions, all components need to be completely gaseous. Further restrictions of state conditions apply for approximations of compression factors using virial coefficients (see Annex A).