avogadro's law
C2Highly Technical / Scientific
Definition
Meaning
A fundamental principle of chemistry stating that equal volumes of all gases, at the same temperature and pressure, contain an equal number of molecules.
A scientific law used to relate the volume of a gas to the amount of substance, forming the basis for defining the mole, and essential in gas law calculations and stoichiometry.
Linguistics
Semantic Notes
The law is named after Amedeo Avogadro. It is a foundational law of ideal gas behavior, often introduced in tandem with Avogadro's number (the number of particles in one mole). It is not a 'law' in a legal sense but a scientific observation that holds under ideal conditions.
Dialectal Variation
British vs American Usage
Differences
No difference in meaning or application. Potential minor pronunciation differences in 'Avogadro' and occasional spelling differences in related terms (e.g., 'litre' vs 'liter').
Connotations
Identical, purely technical.
Frequency
Equally frequent within the specific domain of chemistry education and professional discourse in both regions.
Vocabulary
Collocations
Grammar
Valency Patterns
Avogadro's law [verb] that... (e.g., states, shows, implies)According to [Avogadro's law], ...[One] can [verb] [Avogadro's law] to... (e.g., apply, use)Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “N/A”
Usage
Context Usage
Business
N/A. Extremely rare; only relevant if discussing specific scientific manufacturing or R&D.
Academic
Primary usage. Found in chemistry textbooks, lectures, and exams. Essential for understanding gas laws and stoichiometry.
Everyday
Virtually never used in casual conversation.
Technical
Core terminology in chemistry, physics, and engineering contexts involving gas behavior, thermodynamics, and material science.
Examples
By Part of Speech
verb
British English
- N/A
American English
- N/A
adverb
British English
- N/A
American English
- N/A
adjective
British English
- The Avogadro law principle is fundamental.
- We studied the Avogadro law relationship.
American English
- The Avogadro law principle is fundamental.
- We studied the Avogadro law relationship.
Examples
By CEFR Level
- Avogadro's law is a science topic.
- In chemistry, Avogadro's law helps us understand gases.
- The law says that gas volume depends on the number of molecules.
- According to Avogadro's law, one mole of any ideal gas occupies 22.4 litres at standard temperature and pressure.
- You can derive the ideal gas equation by combining Avogadro's law with Boyle's and Charles's laws.
- Avogadro's law postulates the direct proportionality between the volume and the amount of substance of a gas under isothermal and isobaric conditions, a cornerstone of stoichiometric calculations.
- Critically evaluating the assumptions behind Avogadro's law reveals its limitations with real gases at high pressures.
Learning
Memory Aids
Mnemonic
AVOGADRO: All Volumes Of Gases, At Defined Ratios, are (the) same. One mole of any gas at STP fills a room of ~22.4 litres.
Conceptual Metaphor
A GAS AS A CROWD OF IDENTICAL PARTICLES: Just as equal-sized rooms hold the same number of identical people (if packed equally tightly), equal volumes of gases hold the same number of molecules (at the same temperature and pressure).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not translate 'law' as 'закон' in the legal sense; the scientific meaning ('закон' as in 'закон природы') is correct.
- Ensure the name 'Avogadro' is not transliterated differently or confused with other scientific terms.
- The possessive 's is a fixed part of the term, not a grammatical indicator to be translated.
Common Mistakes
- Pronouncing 'Avogadro' incorrectly (e.g., Av-o-GAD-ro).
- Confusing it with 'Avogadro's number' (6.022 x 10^23). The law is about volume, the number is the count per mole.
- Applying it to liquids or solids (it only applies to gases).
- Forgetting that it requires identical temperature and pressure conditions.
Practice
Quiz
Which condition is NOT required for Avogadro's law to be valid?
FAQ
Frequently Asked Questions
Amedeo Avogadro (1776–1856) was an Italian scientist. His hypothesis, published in 1811, later became known as Avogadro's law.
Yes, it describes the behavior of ideal gases perfectly. Real gases approximate this law under standard conditions but deviate at high pressures and low temperatures.
Avogadro's law established that the number of molecules in a given volume is constant for all gases at standard conditions. Avogadro's number (6.022 x 10^23) is the exact count of particles (atoms, molecules, etc.) in one mole of a substance, which was later determined based on this concept.
It is used to calculate the volume of gas produced or consumed in a chemical reaction, to determine molar masses of gases, and to convert between gas volumes and moles in stoichiometry problems.