What is viscosity a measure of?

Viscosity is a measure of a liquid's resistance to flow, which is commonly described in terms of thickness. A liquid with high viscosity flows more slowly than one with low viscosity. For example, honey has a higher viscosity compared to water, meaning it is thicker and does not flow as easily. This property is crucial in various applications, including understanding how liquids behave under different conditions, such as in engineering, chemical processes, and even in food science. The relationship between viscosity and temperature is also significant, as increasing temperature typically decreases viscosity, but that refers to the effect of temperature rather than what viscosity measures itself. Thus, viscosity fundamentally pertains to the thickness of a liquid.