Viscosity

Definition

Viscosity is a measure of a liquid's resistance to flow. It quantifies the internal friction within the fluid.

5 Must Know Facts For Your Next Test

1. Viscosity decreases with an increase in temperature for most liquids.
2. Higher viscosity means a liquid flows more slowly.
3. Viscosity is measured in units called poise (P) or centipoise (cP).
4. Motor oil and honey are examples of liquids with high viscosity.
5. Water and alcohol have low viscosity compared to other common liquids.

Review Questions

• How does temperature affect the viscosity of most liquids?
• What unit is used to measure viscosity?
• Why does honey flow slower than water?

Related terms

Surface Tension:

The energy required to increase the surface area of a liquid due to intermolecular forces.

Cohesion:

The attraction between molecules within the same substance, contributing to phenomena like surface tension.

Adhesion:

The attraction between molecules of different substances, important in capillary action and meniscus formation.