Viscosity - [updated]

Viscosity is a fundamental property of fluids—both liquids and gases—that describes their internal resistance to flow. Often colloquially referred to as a fluid's "thickness," it is a measure of the friction that occurs between adjacent layers of a fluid moving at different velocities. While water flows easily and has a low viscosity, substances like honey or molasses are highly viscous, moving much more slowly under the same applied force. The Science Behind the Flow

At a molecular level, viscosity arises from the interactions and collisions between molecules within a substance. viscosity

Resistance is primarily caused by cohesive forces between molecules. As the temperature increases, these attractive forces weaken, typically causing the viscosity of a liquid to decrease—which is why cold syrup is harder to pour than warm syrup. Viscosity is a fundamental property of fluids—both liquids

Fluids are generally categorized based on how their viscosity behaves under stress: The Role of Oil Viscosity in Performance - BRAKEmax The Science Behind the Flow At a molecular

Viscosity is modeled based on the exchange of momentum between molecules during collisions. Unlike liquids, the viscosity of a gas often increases with temperature because more frequent collisions at higher speeds lead to greater internal resistance. Newtonian vs. Non-Newtonian Fluids