The viscosities of liquids can be compared by observing their rates of flow through a glass tube. A simple device called a Redwood viscometer can be adapted easily for the laboratory. Comparing viscosities using a viscometer A viscometer is shown in Figure 1. Using the apparatus in Figure 1, fill the funnel with liquid to […]

## Deriving & Measuring viscosity using Stokes’ law

Here we will derive the formula of viscosity using Stoke’s law. We have already derived one expression of viscosity using the flow of a viscous fluid between two parallel plates. Now we derive a different equation of viscosity or coefficient of viscosity in terms of terminal velocity. When a sphere is released and allowed to […]

## Viscosity – definition, derivation, coefficient of viscosity

Here we will define & discuss the concepts of viscosity and derive the formula of the coefficient of viscosity. When we pour a glass of water, it flows freely and quickly. But when we pour honey that flows slowly and sticks to the container. The cause behind this difference is fluid friction, both within the […]