Calculating Time To Sink From Density. Ρ is the density m is the mass v is the volume the calculation of density is quite straightforward. However, it is important to pay special attention to the units used for density.

To calculate density, you need the values for mass and. Ρ p = 18 µ v t /d 2 + ρ m viscosity of medium : Subtract the weight of the sinking.