Viscosity is defined as what?

• A. Density at room temperature
• B. The color of the liquid
• C. Resistance to flow
• D. Boiling point

Answer: (C)

Viscosity describes how much a liquid resists flowing when a force is applied. It tells you how thick or thin a liquid is and how slowly it moves under gravity or stirring. A high viscosity means the liquid flows slowly (like honey), while a low viscosity means it flows easily (like water). Density at room temperature, color, and boiling point relate to other properties (mass per volume, appearance, and the temperature at which a liquid boils), not how a liquid moves, so they don’t define viscosity.