Question
Which one of the following substances has the greatest viscosity?
- water
- mercury
- oxygen
- hydrogen
Answer
Mercury
Explanation
Viscosity is a measure of a fluid’s resistance to flow. It arises due to the cohesive forces between the molecules of the fluid, which cause them to exert a drag force on each other when the fluid is in motion. A fluid with a high viscosity will be thicker and more resistant to flow than a fluid with a low viscosity.
