The resistance of a liquid to flow is _____.

The resistance of a liquid to flow is _____.

• A. Viscosity
• B. Velocity
• C. Reciprocity
• D. Density

Answer: (A)

Viscosity is the measure of a liquid’s resistance to flow caused by internal friction between its molecules. This is why water pours smoothly while honey flows slowly—the higher the viscosity, the greater the resistance to movement under the same applied force. In real-world terms, viscosity governs how fluids behave in pipes, in lubricants, and in coatings. The other terms describe different properties: velocity is how fast the liquid moves, density is the mass per unit volume, and reciprocity is not a property used to describe a liquid’s flow behavior.

Viscosity is the measure of a liquid’s resistance to flow caused by internal friction between its molecules. This is why water pours smoothly while honey flows slowly—the higher the viscosity, the greater the resistance to movement under the same applied force. In real-world terms, viscosity governs how fluids behave in pipes, in lubricants, and in coatings. The other terms describe different properties: velocity is how fast the liquid moves, density is the mass per unit volume, and reciprocity is not a property used to describe a liquid’s flow behavior.