1.1本简化公制实践指南提供了一个换算系数表，用于将屋顶行业特有的计量单位表示为精确的公制单位。本指南基于实践E 380。在基本单位方面精确的关系后面有一个星号。不带星号的关系要么是物理测量的结果，要么只是近似值。

1.1 This abbreviated metric practice guide provides a table of conversion factors for expressing units of measure peculiar to the roofing industry as exact metric units. This guide is based on Practice E 380. Relationships that are exact in terms of the base unit are followed by an asterisk. Relationships that are not followed by an asterisk are either the result of physical measurements or are only approximate.