Examine the equation $\int _ { 5 } ^ { 16 } H ( t ) d t = 70$ where $H$ represents the rate that human hair grows in inches as a function of time and $t$ is measured in years.

Write a complete description about what the integral will compute. In other words, in the context of the problem, what is accumulated? Use correct units and be sure to mention the meaning of the bounds in your description.