IEC 60721-2-3:20 13介绍了自然界中出现的不同气压值的选择。在为产品应用选择适当的气压严重程度时，其预期用作背景材料的一部分，这些产品在储存、运输和使用过程中容易暴露。第二版取消并取代了1987年出版的第一版，构成了技术修订。与上一版相比，主要变化如下: -删除降低海拔冷却效率的数字； -表1的简化； -从海拔高度计算气压的附加公式。

IEC 60721-2-3:2013 presents a selection of different values of air pressure appearing in nature. It is intended to be used as part of the background material when selecting appropriate severities of air pressure for product applications, which products are liable to be exposed during storage, transportation and use. This second edition cancels and replaces the first edition, published in 1987, and constitutes a technical revision. The main changes with regard to the previous edition are as follows:
- removal of figures for decreasing cooling efficiency for altitude;
- simplification of Table 1;
- additional formula for calculating air pressure from altitude.