# Arrhenius Number

Written by Jerry Ratzlaff. Posted in Dimensionless Numbers

Archimedes number is a dimensionless number used in mass transfer in general, and reaction rate calculations in particular.

## FORMULA

$$\alpha = \frac {E_a} {RT}$$

Where:

$$E_a$$ = activation energy

$$R$$ = universal gas constant

$$T$$ = temperature