All of them lived well over 100 years ago one more than 400 years ago.' CentiPoise 'The standard units given to these measurements are named after the physical scientists Pascal, Poiseuille and Stokes.

Dynamic viscosity (also called absolute viscosity) is a measure of flow under applied pressure kinetic viscosity is a measure of flow under gravity. 'The types of viscosity measurements most commonly used in the are dynamic and kinetic viscosity. To complicate things, different applications can use different unit systems. 'There are several types of viscosity, each with its own unit. Formally, it is the ratio of the shearing stress to the velocity gradient of a fluid. (Something to keep in mind when you stand next to your viscometer next Christmas.) Viscosity is a measure of a fluid's resistance to flow. 'The word viscosity is derived from the Latin viscum, meaning mistletoe but also a viscous glue made from mistletoe berries. This is not a treatise on the subject just a compilation of some of the things I forgot (or never knew) and background that I found interesting. The terms, the units, the relationships between them and even the names of the pioneers in the field. Looking for a replacement made me aware that I needed a refresher course on viscosity. 'Recently, a very old, inexpensive viscometer used in one of the labs stopped working. Here, Karl Laden, Ph.D., technical manager at Alpa Cosmetics Co., Ltd., weighed in to provide the answers, which are illustrated in Laden's following story: Does the shampoo flow easily, yet luxuriously, from the bottle? Is the lotion creamy as it is squeezed from the tube? And how do we measure these characteristics? Viscosity is one of the most fundamental characteristics consumers perceive when using a personal care product.

How to test viscosity in cp