Definition

1. Noun:
   • A measure of the resistance to flow of a fluid under an applied force: Absolute viscosity, also known as dynamic viscosity, quantifies a fluid's internal friction. It describes how much force is required to make one layer of fluid move relative to another layer.

Usage and Examples

• Noun:
  • Engine oil must maintain an appropriate absolute viscosity across a range of temperatures to lubricate effectively.
  • The absolute viscosity of honey is much higher than that of water, which is why it pours so slowly.
  • Scientists measured the absolute viscosity of the new polymer solution in the laboratory.

Advanced Usage

• Technical Context: In fluid dynamics and rheology, absolute viscosity is a fundamental property. It is often represented by the Greek letter eta (η) and its standard SI unit is the pascal-second (Pa·s).
  • The calculations require the absolute viscosity of the liquid to be expressed in centipoise.

Variants and Related Terms

• Dynamic Viscosity: A direct synonym for absolute viscosity.
• Kinematic Viscosity: A related but distinct property, calculated as absolute viscosity divided by the fluid's density.
• Viscosity (noun): The broader, more general term for a fluid's resistance to flow, which can sometimes be used interchangeably with absolute viscosity in non-technical contexts.

Synonyms

• Dynamic viscosity: The most precise synonym.
• Coefficient of viscosity: Another technical term for the same property.

Related Phrases and Concepts

• Shear stress: The applied force per unit area that causes layers of fluid to slide past one another, directly related to measurements of absolute viscosity.
• Newtonian fluid: A fluid for which the absolute viscosity is constant, independent of the applied shear rate.

Noun

1. a measure of the resistance to flow of a fluid under an applied force