Dynamic viscosity is a measure of a fluid's resistance to flow. It quantifies how thick or thin a fluid is, indicating how easily it can move. For example, honey has a higher dynamic viscosity than water, meaning it flows more slowly. This property is essential in various fields, including engineering and fluid mechanics, as it affects how fluids behave under different conditions. The unit of dynamic viscosity is the Pascal-second (Pa·s) in the International System of Units (SI). It can also be expressed in poise, where 1 poise equals 0.1 Pa·s. Understanding dynamic viscosity helps in designing systems involving fluids, such as pipelines and pumps.