[1] For liquids, it corresponds to the informal concept of thickness; for example, syrup has a higher viscosity than water. [3] Viscosity is defined scientifically as a force multiplied by a time divided by an area. Thus its SI units are newton-seconds per metre squared, or pascal-seconds. [2]

By definition, viscosity is a fluid’s resistance to flow or deformation. A fluid with a high viscosity, such as honey, flows as a slower rate than a less viscous fluid, such as water.

Viscosity is defined as the measure of the resistance offered by a liquid to its flow. Liquids with low viscosity (like water) flow easily, whereas liquids with high viscosity (like honey) flow slowly and with greater difficulty.

The internal friction that arises due to this difference in velocity is termed viscosity. Fluids with high viscosity (like honey or oil) flow more slowly, while fluids with low viscosity (like water or air) flow more readily. Viscosity is sometimes referred to as the "thickness" of a fluid.

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