coefficient of viscosity: meaning, definition, pronunciation and examples
C2Technical/Scientific
Quick answer
What does “coefficient of viscosity” mean?
A constant that quantifies a fluid's internal resistance to flow.
Audio
Pronunciation
Definition
Meaning and Definition
A constant that quantifies a fluid's internal resistance to flow.
A physical property, typically denoted by the Greek letter μ or η, that measures the force per unit area required to maintain a unit velocity gradient in a fluid. It is a key parameter in fluid dynamics, rheology, and engineering.
Dialectal Variation
British vs American Usage
Differences
No lexical or spelling differences. The concept and terminology are identical in both scientific communities.
Connotations
Purely technical with no cultural connotations in either variety.
Frequency
Used with identical frequency in relevant scientific and engineering fields in both the UK and US.
Grammar
How to Use “coefficient of viscosity” in a Sentence
The coefficient of viscosity of [FLUID] is [VALUE].To calculate [PHENOMENON], one needs the coefficient of viscosity.[FLUID] has a high/low coefficient of viscosity.Vocabulary
Collocations
Examples
Examples of “coefficient of viscosity” in a Sentence
adjective
British English
- The viscosity-coefficient data was plotted.
- A high-coefficient-of-viscosity fluid was selected.
American English
- The viscosity-coefficient data was plotted.
- A high-coefficient-of-viscosity fluid was selected.
Usage
Meaning in Context
Business
Virtually never used.
Academic
Core term in physics, chemical engineering, mechanical engineering, and materials science courses and research.
Everyday
Not used in everyday conversation.
Technical
Fundamental parameter in fluid mechanics, lubrication engineering, polymer processing, paint formulation, and food science.
Vocabulary
Synonyms of “coefficient of viscosity”
Strong
Neutral
Weak
Vocabulary
Antonyms of “coefficient of viscosity”
Watch out
Common Mistakes When Using “coefficient of viscosity”
- Using 'coefficient of viscosity' to mean 'kinematic viscosity' (which is dynamic viscosity divided by density).
- Pronouncing 'viscosity' with /z/ instead of /s/ (it's /vɪˈskɒs.ə.ti/, not /vɪˈzkɒs.ə.ti/).
- Treating it as a countable noun in plural contexts without reason (e.g., 'different coefficients of viscosities' is wrong; use 'different coefficients of viscosity' or 'different viscosity coefficients').
FAQ
Frequently Asked Questions
In strict technical terms, 'coefficient of viscosity' (or dynamic viscosity) is the quantitative measure that defines the property of 'viscosity'. In many engineering contexts, however, 'viscosity' is used interchangeably to mean the coefficient.
In the SI system, the unit is the pascal-second (Pa·s). The common CGS unit is the poise (P), where 1 Pa·s = 10 P. Centipoise (cP) is also frequently used (1 cP = 0.01 P = 0.001 Pa·s).
For liquids, the coefficient of viscosity typically decreases exponentially with increasing temperature. For gases, it generally increases with temperature.
Dynamic viscosity (coefficient of viscosity, μ) is the measure of internal resistance to flow. Kinematic viscosity (ν) is the dynamic viscosity divided by the fluid density (ν = μ/ρ). It relates viscous forces to inertial forces.
A constant that quantifies a fluid's internal resistance to flow.
Coefficient of viscosity is usually technical/scientific in register.
Coefficient of viscosity: in British English it is pronounced /ˌkəʊ.ɪˈfɪʃ.ənt əv vɪˈskɒs.ə.ti/, and in American English it is pronounced /ˌkoʊ.əˈfɪʃ.ənt əv vɪˈskɑː.sə.t̬i/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think of a COEFFICIENT as a number that CO-EFFICIENTLY explains how VISCOUS (thick/sticky) a fluid is. It's the 'coefficient' for 'viscosity'.
Conceptual Metaphor
VISCOSITY IS INTERNAL FRICTION. The coefficient quantifies this friction.
Practice
Quiz
What does the coefficient of viscosity directly measure?