electric constant
Rare (C2/Technical)Exclusively technical/scientific; primarily used in physics, engineering, and advanced academic contexts.
Definition
Meaning
The fundamental physical constant (ε₀) that describes the ability of a vacuum to permit electric field lines; the permittivity of free space.
In physics, it is the constant that appears in Coulomb's law and relates units of electric charge to mechanical quantities like force and distance. It quantifies the resistance encountered when forming an electric field in a vacuum.
Linguistics
Semantic Notes
Not to be confused with 'dielectric constant' (relative permittivity), which is a material-specific property. The electric constant is a universal, fixed value for the vacuum.
Dialectal Variation
British vs American Usage
Differences
No lexical differences. The concept and term are identical in both varieties. Spelling follows local conventions in surrounding text (e.g., 'metre' vs. 'meter' in example sentences).
Connotations
None; purely technical term.
Frequency
Equally rare and specialized in both dialects, confined to identical technical fields.
Vocabulary
Collocations
Grammar
Valency Patterns
The electric constant [is/equals/has a value of] 8.854...Calculate using the electric constant.The formula incorporates the electric constant ε₀.Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “N/A”
Usage
Context Usage
Business
Never used.
Academic
Used in advanced undergraduate and postgraduate physics, electromagnetism, and engineering textbooks and papers.
Everyday
Never used.
Technical
Core term in theoretical and applied physics, electrical engineering (especially in field theory and capacitor design).
Examples
By Part of Speech
verb
British English
- The equation is derived by incorporating the electric constant.
- We must dimensionalise the charge using the electric constant.
American English
- You need to factor in the electric constant to solve this.
- The formula utilizes the electric constant to relate force and charge.
Examples
By CEFR Level
- N/A (This term is far above A2 level.)
- N/A (This term is far above B1 level.)
- In physics, the electric constant is a very important number for calculations with electric forces.
- The numerical value of the electric constant, ε₀, is approximately 8.854 × 10⁻¹² F/m, and it is fundamental to Maxwell's equations.
- You cannot accurately calculate the force between two charges in a vacuum without using the electric constant.
Learning
Memory Aids
Mnemonic
Think 'Epsilon Zero for Empty space' – ε₀ is the permit for electric fields in the vacuum.
Conceptual Metaphor
The 'stiffness' or 'resistance' of the vacuum to the formation of electric fields.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not translate as 'электрическая константа' (too literal and rare). The correct established term is 'электрическая постоянная' or 'постоянная вакуума ε₀'.
- Avoid confusing it with 'диэлектрическая проницаемость' (dielectric constant), which is relative permittivity (κ or εᵣ).
Common Mistakes
- Using 'electric constant' to refer to a material's dielectric constant.
- Pronouncing the symbol ε₀ as 'e-zero' instead of 'epsilon nought' or 'epsilon zero'.
- Misspelling 'permittivity' as 'permitivity'.
Practice
Quiz
What is the most precise synonym for 'the electric constant'?
FAQ
Frequently Asked Questions
No. The electric constant (ε₀) is the permittivity of a perfect vacuum. The dielectric constant (εᵣ or κ) is a dimensionless number that describes how much a specific material's permittivity compares to ε₀.
It is a fundamental constant of nature that defines the strength of the electric force in a vacuum. It links the units of electricity to mechanics and is essential in all electromagnetic field calculations.
Yes. In SI units, it is measured in farads per metre (F/m).
No, it is considered a fixed, universal constant in the standard model of physics, defining the properties of the electromagnetic interaction in a vacuum.