# Question: viscosities will be determined via the equation rt ...

###### Question details

Viscosities will be determined via the equation η=
(η_{r}ρt) / (p_{r}t_{r)} where ηr, ρr, and
tr are the viscosity, density, and flow time of the reference
liquid, which is usually water. Assume that the uncertainty in the
viscosity will be primarily determined by the uncertainty in the
flow times. Derive an expression for the relative error in the
viscosity.