# Characteristic Length

Written by Jerry Ratzlaff on . Posted in Classical Mechanics

Characteristic length, abbreviated as $$l_c$$, is the scale of a physical system.  The length is used in 2D and 3D systems for Fluid Dynamics and Thermodynamics defining the parameter of the system.

Examples of:

### Characteristic Length Formula

$$\large{ l_c = \frac{ V } { A } }$$

Where:

$$\large{ l_c }$$ = characteristic length

$$\large{ A }$$ = object surface area

$$\large{ V }$$ = object