# Characteristic Length

Written by Jerry Ratzlaff on . Posted in Classical Mechanics

## Characteristic Length

Characteristic length ( $$l$$ ) is an important dimension that defines the scale of a physical system. This dimension will vary depending on the system requirements, height of an obstacle, length of the cylinder, etc.

### Characteristic Length Formula

$$\gamma = \frac { V } { A }$$          $$characteristic \; length \;=\; \frac { volume \; of \; the \; body } { surface \; area \; of \; the \; body }$$

Where:

$$l$$ = characteristic length

$$V$$ = volume of the body

$$A$$ = surface area of the body