lambert
LowTechnical / Scientific
Definition
Meaning
A unit of luminance (or luminous intensity per unit area) in the centimetre-gram-second (CGS) system.
The name can also refer to a surname of English and French origin, and, rarely, as an archaic given name.
Linguistics
Semantic Notes
As a scientific unit, it is named after Johann Heinrich Lambert. It is largely obsolete, having been superseded by the candela per square metre (cd/m²) in the SI system.
Dialectal Variation
British vs American Usage
Differences
No significant difference in usage; it's a technical, standardized term.
Connotations
Purely technical, historical in scientific context.
Frequency
Extremely rare in both dialects outside of historical or specialized physics/optics contexts.
Vocabulary
Collocations
Grammar
Valency Patterns
The screen emitted a luminance of X lamberts.It was measured in lamberts.Vocabulary
Synonyms
Strong
Neutral
Weak
Usage
Context Usage
Business
Virtually never used.
Academic
Only in historical discussions of photometry or optics.
Everyday
Not used.
Technical
Used occasionally in older technical literature or for specific calculations in photometry.
Examples
By CEFR Level
- The old book mentioned a measurement called a lambert.
- In the CGS system, luminance can be expressed in lamberts, though it's rarely used today.
- The physicist converted the legacy data from lamberts to the modern SI unit of candelas per square metre.
Learning
Memory Aids
Mnemonic
Think of LAMB + BRIGHT. A LAMBert is an old measure of how bright something is, named after Mr. Lambert.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with the name/surname 'Ламберт'.
- It is not a common noun in Russian; the concept is 'ламберт' (unit) or more commonly 'кандела на квадратный метр'.
Common Mistakes
- Using it as a current unit instead of candela per square metre.
- Capitalising it incorrectly in the middle of a sentence when referring to the unit (it is lowercase).
Practice
Quiz
What is a 'lambert'?
FAQ
Frequently Asked Questions
No, it is largely obsolete and has been replaced by the SI unit candela per square metre (cd/m²).
It was named after the Swiss polymath Johann Heinrich Lambert (1728–1777).
Yes, it is a common English and French surname, and historically a given name, unrelated to the scientific unit.
1 lambert = (1/π) × 10^4 candelas per square metre, approximately 3183.1 cd/m².