# Elasticity Number

Elasticity number, abbreviated as El, a dimensionless number.

## Formulas that use Elasticity Number

\(\large{ El = \frac { t \; \eta} { \rho \; r^2 } }\) |

### Where:

\(\large{ El }\) = elasticity number

\(\large{ \rho }\) (Greek symbol rho) = density

\(\large{ r }\) = pipe radius

\(\large{ t }\) = relaxation time

\(\large{ \eta }\) (Greek symbol eta) = viscosity