dielectric constant: meaning, definition, pronunciation and examples
C1/C2Formal, Technical, Academic
Quick answer
What does “dielectric constant” mean?
A dimensionless number measuring a material's ability to store electrical energy in an electric field relative to a vacuum.
Audio
Pronunciation
Definition
Meaning and Definition
A dimensionless number measuring a material's ability to store electrical energy in an electric field relative to a vacuum.
Also known as relative permittivity (εᵣ). It quantifies how much the electric field within a material is reduced compared to the field in a vacuum, influencing capacitance and the speed of electromagnetic waves.
Dialectal Variation
British vs American Usage
Differences
The term is identical and standard in both. However, the alternative term 'relative permittivity' is often preferred in more formal physics and engineering contexts, slightly more common in British academic writing.
Connotations
No significant connotative differences. 'Dielectric constant' can imply a more practical or applied engineering perspective compared to the theoretically precise 'relative permittivity'.
Frequency
Equally frequent in technical domains of both varieties.
Grammar
How to Use “dielectric constant” in a Sentence
The dielectric constant of [material] is [value].[Material] has a dielectric constant of [value].Vocabulary
Collocations
Examples
Examples of “dielectric constant” in a Sentence
verb
British English
- [No verb form. The related process is 'to polarise'.]
American English
- [No verb form. The related process is 'to polarize'.]
adverb
British English
- [No standard adverb form.]
American English
- [No standard adverb form.]
adjective
British English
- The dielectric-constant measurement is crucial for the substrate.
American English
- We need the dielectric-constant value for the polymer film.
Usage
Meaning in Context
Business
Rare. May appear in procurement or specification sheets for electronic components and insulating materials.
Academic
Core term in physics, electrical engineering, materials science, and chemistry papers and textbooks.
Everyday
Extremely rare. Unlikely outside specific technical discussions.
Technical
Fundamental and frequent. Essential for designing capacitors, transmission lines, semiconductor devices, and understanding material interactions with EM fields.
Vocabulary
Synonyms of “dielectric constant”
Strong
Neutral
Weak
Vocabulary
Antonyms of “dielectric constant”
Watch out
Common Mistakes When Using “dielectric constant”
- Using it as a universal constant (like pi).
- Confusing it with 'dielectric strength' (which is about maximum electric field before breakdown).
- Omitting 'relative' when simply using 'permittivity', which has different units.
FAQ
Frequently Asked Questions
No, the name is misleading. It is a material property that can vary significantly with factors like temperature, frequency of the applied electric field, and humidity.
A high dielectric constant means the material is highly polarisable; it reduces the electric field strength within it more effectively and allows a capacitor to store more charge for the same voltage.
By definition, the dielectric constant (relative permittivity) of a perfect vacuum is exactly 1.
Dielectric constant measures energy storage (permittivity). Dielectric strength measures the maximum electric field a material can withstand before it breaks down and conducts (a voltage threshold).
A dimensionless number measuring a material's ability to store electrical energy in an electric field relative to a vacuum.
Dielectric constant is usually formal, technical, academic in register.
Dielectric constant: in British English it is pronounced /ˌdaɪ.ɪˈlek.trɪk ˈkɒn.stənt/, and in American English it is pronounced /ˌdaɪ.ɪˈlek.trɪk ˈkɑːn.stənt/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “[No established idioms for this technical term]”
Learning
Memory Aids
Mnemonic
Think of a DIELECTRIC (insulator) material's CONSTANT ability to store charge compared to empty space (a vacuum).
Conceptual Metaphor
A SPONGE FOR ELECTRIC FIELDS. A high dielectric constant means the material is a 'thirstier sponge' for electric field lines.
Practice
Quiz
What is a primary synonym for 'dielectric constant' in formal physics?