The reciprocal of viscosity is called what?

The reciprocal of viscosity is called what?

• A. Density
• B. Fluidity
• C. Conductivity
• D. Permeability

Answer: (B)

This question tests your understanding of how viscosity relates to flow. Viscosity measures a fluid’s resistance to flow; the smaller the viscosity, the easier the fluid moves. The reciprocal of viscosity, 1/ viscosity, is defined as fluidity—the measure of how easily the fluid can flow. So fluidity is the correct term for the inverse relationship. Density, conductivity, and permeability describe different properties (mass per volume, transfer of heat/electricity, and ability to move through a porous medium, respectively) and don’t represent the flow ease of the liquid itself.

This question tests your understanding of how viscosity relates to flow. Viscosity measures a fluid’s resistance to flow; the smaller the viscosity, the easier the fluid moves. The reciprocal of viscosity, 1/ viscosity, is defined as fluidity—the measure of how easily the fluid can flow. So fluidity is the correct term for the inverse relationship. Density, conductivity, and permeability describe different properties (mass per volume, transfer of heat/electricity, and ability to move through a porous medium, respectively) and don’t represent the flow ease of the liquid itself.