What happens to viscosity as the temperature decreases?

As the temperature decreases, the viscosity of a liquid typically increases. Viscosity refers to the thickness or resistance to flow of a fluid. When the temperature drops, the kinetic energy of the molecules in the fluid decreases, leading to a slower movement of those molecules. This slower movement causes the molecules to interact more strongly with one another, resulting in greater resistance to flow. Consequently, the fluid becomes thicker and more viscous.

This relationship is significant in various applications, including those encountered in radiology, where different contrast agents used in imaging may exhibit changes in viscosity depending on their temperature. Understanding how temperature affects viscosity helps in managing the administration of these substances during various procedures.