A pressure measurement can further be described by the type of measurement being performed. There are three types of pressure measurements: absolute, gauge, and differential. Absolute pressure measurement is measured relative to a vacuum (Figure 2).
For example, the median tenure of workers ages 55 to 64 (10.1 years) was more than three times that of workers ages 25 to 34 years (2.8 years). Also, a larger proportion of older workers than younger workers had 10 years or more of tenure.
E.g. If a company has 3 employees: John has worked there for 3 years, Susie has worked there for 8 years, and Wiremu has worked there for 13 years, then the average employee seniority would be 8 years.