Viscosity
| Formula / Notation | η = (F/A)/(dv/dx); SI unit: Pa·s (Poise) |
|---|---|
| Also Known As | Dynamic viscosity, absolute viscosity, fluid viscosity, η (eta) |
What is Viscosity?
The resistance of a fluid to flow, arising from intermolecular forces and internal friction. High viscosity fluids flow slowly (honey, motor oil). Viscosity decreases with increasing temperature for liquids. Expressed in Pascal-seconds (Pa·s) or centipoise (cP).
Formula & Notation
Other Names / Synonyms: Dynamic viscosity, absolute viscosity, fluid viscosity, η (eta)
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
The resistance of a fluid to flow, arising from intermolecular forces and internal friction. High viscosity fluids flow slowly (honey, motor oil). Viscosity decreases with increasing temperature for liquids. Expressed in Pascal-seconds (Pa·s) or centipoise (cP).
Viscosity is a critical property in the design of pumps, pipes, and lubrication systems. The viscosity of motor oils and lubricants determines their performance at different temperatures. In pharmaceutical manufacturing, viscosity affects drug formulation and delivery.
Highly viscous chemicals are harder to pump and mix, potentially causing process hazards. Low-viscosity volatile liquids can spread and evaporate rapidly, increasing fire and inhalation risks. Safe handling procedures account for the viscosity of chemical substances.
The formula or notation for Viscosity is: η = (F/A)/(dv/dx); SI unit: Pa·s (Poise)