Viscosity vs Rheology | difference between Viscosity and Rheology

This page compares Viscosity vs Rheology and mentions difference between Viscosity and Rheology.

Viscosity

• Viscosity: It is the inherent property of fluid which offers resistance to the flow.
• Viscosity of liquids decreases with increase in the temperature.
• Viscosity of gases increases with increase in the temperature.
• Viscosity can be defined as measurement of fluid internal resistance to flow at specified temperature.
• It can be expressed in units of centipoise (cP), which is equivalent to 1 mPa.second. • There are two methods to measure viscosity of a fluid viz. dynamic viscosity and kinematic viscosity.
Refer difference between Dynamic viscosity vs Kinematic viscosity >> for more information.
• Viscometer is used to study viscosity.

Rheology

• It is the measurement to study flow of materials.
• It is useful to study fluids and soft solids.
• Viscosity is also used in rheology to study flow of materials.
• Rheology helps to study more than liquid's viscosity.
• It is useful to study materials which fall between purely elastic & Newtonian fluids.
• Rheometer is used to study rheology.

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