What is viscosity?

What is viscosity?

• A. Measure of engine oil fluidity
• B. Color associated with negative post of battery
• C. Purpose of a budget
• D. Transmits electricity or heat

Answer: (A)

Viscosity is a fluid's resistance to flow, basically how thick or thin a liquid is. It changes with temperature: heat lowers viscosity so the liquid flows more easily, while cold raises viscosity so it flows less easily. In engines, oil must flow enough to reach all moving parts and still form a protective film as it works. Describing viscosity as a measure of engine oil fluidity best captures this idea because it focuses on how readily the oil can flow to lubricate. The other statements refer to color, budgeting, or transmitting electricity or heat, which aren’t about how a liquid moves.

Viscosity is a fluid's resistance to flow, basically how thick or thin a liquid is. It changes with temperature: heat lowers viscosity so the liquid flows more easily, while cold raises viscosity so it flows less easily. In engines, oil must flow enough to reach all moving parts and still form a protective film as it works. Describing viscosity as a measure of engine oil fluidity best captures this idea because it focuses on how readily the oil can flow to lubricate. The other statements refer to color, budgeting, or transmitting electricity or heat, which aren’t about how a liquid moves.