Tensile strength is defined as a stress, which is measured as force per unit area. For some non-homogeneous materials (or for assembled components) it can be reported just as a force or as a force per unit width.
Answer Wiki. The practice of organizing to aggregate individuals' influence for economic reasons probably began with European craft guilds, although the master craftsmen were actually employers and capitalists. Trade unions or labor unions originated in England in the 1700s, but were outlawed until the 1800s.
1 A union is an organization established by and for workers to pursue collective workplace goals: wages, benefits, work rules, power. 2  Unions arose after the Civil War as one response to modern industrial economy. 3  Unions grew rapidly from 1930s-50s, shrank from 1960s-present.