avogadro
C2Technical/Scientific
Definition
Meaning
The name of the Italian scientist Amedeo Avogadro, whose hypothesis established that equal volumes of all gases, at the same temperature and pressure, contain the same number of molecules.
Used primarily to refer to Avogadro's constant (Avogadro's number), the number of constituent particles (usually atoms or molecules) in one mole of a substance, approximately 6.02214076×10²³. It is a fundamental constant in chemistry and physics.
Linguistics
Semantic Notes
The word functions almost exclusively as a proper noun, part of the fixed term 'Avogadro's constant/number'. It is rarely used outside of scientific discourse.
Dialectal Variation
British vs American Usage
Differences
No significant differences in usage or pronunciation between British and American English in the scientific context.
Connotations
None; purely denotative in scientific register.
Frequency
Equally rare in general discourse, equally common in scientific/educational contexts in both varieties.
Vocabulary
Collocations
Grammar
Valency Patterns
[Proper Noun] + 's' + [Noun (constant/number/law)]Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “NA”
Usage
Context Usage
Business
Virtually never used.
Academic
Used in chemistry, physics, and materials science textbooks, lectures, and research papers.
Everyday
Extremely rare; might be encountered in science-themed quizzes or documentaries.
Technical
Core term in stoichiometry, physical chemistry, and thermodynamics.
Examples
By CEFR Level
- Scientists use Avogadro's number to count atoms.
- Avogadro's constant, approximately 6.022×10²³, is essential for converting between atomic mass and grams.
- The precision of Avogadro's constant was redefined in 2019, tying it to the newly fixed value of the kilogram.
Learning
Memory Aids
Mnemonic
Think: 'A vogadro of avocados would be a MOLE-ountain of food!' (links Avogadro to the mole concept).
Conceptual Metaphor
SCALE/QUANTITY: Avogadro's number conceptualizes the vast, almost incomprehensible scale of the microscopic world, bridging the atomic and macroscopic realms.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not translate the name; it remains 'Авогадро' (Avogadro).
- Avoid calquing phrases like 'number of Avogadro' – the standard English possessive form 'Avogadro's number' is required.
- Do not confuse with similar-sounding scientific terms like 'argon'.
Common Mistakes
- Mispronunciation: /ˈæv.ə.ɡreɪd/ or /ə.ˈvoʊ.ɡə.droʊ/.
- Misspelling: 'Avagadro', 'Avogadro's'.
- Using 'Avogadro' as a common noun (e.g., 'an avogadro of atoms').
Practice
Quiz
What is Avogadro's constant primarily used for?
FAQ
Frequently Asked Questions
The standard possessive form 'Avogadro's number' (or 'constant') is correct.
No, Amedeo Avogadro proposed the hypothesis. The constant was named in his honour and its value was determined later by other scientists, like Jean Perrin.
Since the 2019 SI redefinition, Avogadro's constant is now a defined exact value: 6.02214076×10²³ mol⁻¹.
Primarily in chemistry and physics, specifically in topics related to stoichiometry, gas laws, and atomic theory.