Use this calculator to calculate coil area result in physics.

## Formula

### $Z = -2\sqrt{\varphi D \tau t} * \left [ erf^{-1}(2-C/C_{o}) \right ]$

Where,

C = concentration at z

Co = initial concentration

z = distance from the source

p = porosity

D = coefficient of molecular diffusion

t = tortuosity

t = time