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.
Since job availability fluctuates with the economy, the average time it takes to find a job increases significantly during a recession. For example, from December 2007 to June 2009, the average length of time between jobs doubled from 5.2 weeks to 10.4 weeks. Increased layoffs and hiring freezes left millions of Americans out of work.