What is the common unit of measurement for viscosity?

Viscosity, which measures a fluid’s resistance to flow, is commonly expressed in units that quantify this property. The Poise is the primary unit for measuring dynamic viscosity in the centimeter-gram-second (CGS) system. One Poise is defined as the viscosity of a fluid that exerts a shear stress of one dyne per square centimeter when a velocity gradient of one reciprocal second exists.

In contrast, other units mentioned, such as Pascal, Newton, and Joule, are associated with different physical properties. Pascal measures pressure, Newton is a unit of force, and Joule quantifies energy or work done. These units do not relate to the flow characteristics of fluids in the same manner that Poise does, making Poise the correct choice for measuring viscosity.