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

C_{o} = initial concentration

z = distance from the source

p = porosity

D = coefficient of molecular diffusion

t = tortuosity

t = time