Certified Lubrication Specialist Practice Test

Centipoise is the unit for reporting which viscosity?

cSt cP API Gravity Demulsibility

Correct Answer:

Explanation:

Dynamic viscosity is reported in centipoise, abbreviated cP. This unit measures the internal friction that resists flow. Centipoise is the common unit for liquids like lubricants and oils. Centistokes (cSt) is a related but different property called kinematic viscosity, which is dynamic viscosity divided by density. API gravity and demulsibility describe other fluid properties (density relative to water and emulsion stability, respectively) and are not viscosity units. In SI terms, 1 centipoise equals 0.001 Pa·s.

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