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viscosity British & World English

The state of being thick, sticky, and semi-fluid in consistency, due to internal friction

dynamic viscosity British & World English

A quantity measuring the force needed to overcome internal friction in a fluid

kinematic viscosity British & World English

A quantity representing the dynamic viscosity of a fluid per unit density

coefficient of viscosity British & World English

The degree to which a fluid resists flow under an applied force, expressed as the ratio of the shearing stress to the velocity gradient. The coefficient of viscosity of liquids decreases as temperature increases because the bonds between molecules are weakened