diffusion coefficient: meaning, definition, pronunciation and examples
Very LowTechnical/Scientific
Quick answer
What does “diffusion coefficient” mean?
A quantitative measure representing the rate at which one substance diffuses through another.
Audio
Pronunciation
Definition
Meaning and Definition
A quantitative measure representing the rate at which one substance diffuses through another.
A fundamental physical constant (D) that appears in Fick's laws, describing the flux of a substance in response to a concentration gradient. In broader scientific contexts, it can be used metaphorically for the rate of spread of non-physical things (e.g., ideas, technologies).
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences. Spelling conventions follow national norms (e.g., 'behaviour' in UK contexts influencing surrounding text). The unit of measurement might be cited differently (e.g., m²/s vs. cm²/s).
Connotations
Identical technical connotations.
Frequency
Equally rare and confined to identical technical fields in both varieties.
Grammar
How to Use “diffusion coefficient” in a Sentence
The diffusion coefficient of [substance] in [medium] is [value].[Substance] has a diffusion coefficient of [value].We determined the diffusion coefficient.Diffusion coefficient increases with temperature.Vocabulary
Collocations
Examples
Examples of “diffusion coefficient” in a Sentence
verb
British English
- [Not applicable as a verb]
American English
- [Not applicable as a verb]
adverb
British English
- [Not applicable as an adverb]
American English
- [Not applicable as an adverb]
adjective
British English
- [Not standard. One might say 'diffusion-coefficient data' in a technical note.]
American English
- [Not standard. One might say 'diffusion-coefficient measurement' in a technical note.]
Usage
Meaning in Context
Business
Virtually never used.
Academic
Exclusively used in STEM disciplines (physics, chemistry, chemical engineering, materials science, biology).
Everyday
Never used.
Technical
The primary and only natural context. Used in research papers, textbooks, lab reports, and technical specifications.
Vocabulary
Synonyms of “diffusion coefficient”
Vocabulary
Antonyms of “diffusion coefficient”
Watch out
Common Mistakes When Using “diffusion coefficient”
- Using 'diffusion coefficient' to describe a general trend instead of a quantified constant.
- Incorrect word order: 'coefficient diffusion'.
- Misspelling 'diffusion'.
- Using without the necessary specifying phrase (e.g., 'the diffusion coefficient' without stating 'of what').
FAQ
Frequently Asked Questions
In most scientific contexts, yes, they are synonymous. 'Diffusivity' is slightly more formal.
The SI unit is square metres per second (m²/s). In practical chemistry and engineering, square centimetres per second (cm²/s) is also common.
Only in very deliberate, metaphorical ways (e.g., 'the diffusion coefficient of misinformation on social media is alarmingly high'), which is a stylistic choice imitating technical language.
Because increased thermal energy makes molecules move faster, dramatically increasing the rate at which they diffuse through a medium.
A quantitative measure representing the rate at which one substance diffuses through another.
Diffusion coefficient is usually technical/scientific in register.
Diffusion coefficient: in British English it is pronounced /dɪˈfjuːʒən ˌkəʊɪˈfɪʃ(ə)nt/, and in American English it is pronounced /dɪˈfjuʒən ˌkoʊəˈfɪʃənt/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “[No established idioms for this technical term]”
Learning
Memory Aids
Mnemonic
Think of D for 'Diffusion speed' – the Coefficient is the number that quantifies it.
Conceptual Metaphor
A 'SPEED METER FOR MOLECULAR MIXING' or a 'PERMEABILITY RATING'.
Practice
Quiz
What does the diffusion coefficient quantitatively describe?