law of multiple proportion
LowTechnical, Academic
Definition
Meaning
A chemical law stating that when two elements combine to form more than one compound, the masses of one element that combine with a fixed mass of the other are in a ratio of small whole numbers.
The principle is often extended in educational contexts to illustrate fundamental stoichiometric relationships and the concept of definite proportions, serving as a foundational rule for understanding chemical formulas and reactions.
Linguistics
Semantic Notes
This is a proper noun naming a specific scientific law. It is highly domain-specific to chemistry and foundational science education. The meaning is precise and invariant.
Dialectal Variation
British vs American Usage
Differences
No lexical or semantic differences. Spelling of 'proportion' is consistent. Pronunciation may differ slightly (see IPA).
Connotations
Identical technical connotations in both varieties.
Frequency
Used with equal (and low) frequency in academic and educational contexts in both regions.
Vocabulary
Collocations
Grammar
Valency Patterns
The law of multiple proportion states that...An example of the law of multiple proportion is......is consistent with the law of multiple proportion.Vocabulary
Synonyms
Strong
Neutral
Weak
Usage
Context Usage
Business
Not used.
Academic
Used in chemistry textbooks, lectures, and exams to describe a fundamental principle of chemical combination.
Everyday
Virtually never used.
Technical
Used in precise discussions of stoichiometry, historical chemistry, and material composition analysis.
Examples
By CEFR Level
- This sentence is too advanced for A2 level.
- Scientists use the law of multiple proportion to understand chemicals.
- The textbook explained how the law of multiple proportion predicts the formulas of nitrogen oxides.
- Dalton's formulation of the law of multiple proportion provided critical evidence for the atomic theory of matter, as it demonstrated that elements combine in discrete, quantifiable packets.
Learning
Memory Aids
Mnemonic
Think of it as the 'LEGO law': if you fix one brick (element A), the other bricks (element B) that snap onto it come in simple, whole-number sets (1, 2, 3...), not in fractions.
Conceptual Metaphor
BUILDING BLOCKS / SIMPLE RATIOS. The law conceptualises chemical combination as the joining of discrete units in fixed, simple, countable ratios.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid translating 'law' as 'право' (right/law in legal sense). Use 'закон'.
- Ensure 'multiple' is translated as 'кратных' (отношений) in this specific context, not 'множественный'.
- The phrase is a fixed term; translate as a whole: 'Закон кратных отношений'.
Common Mistakes
- Incorrectly stating it applies to mixtures rather than compounds.
- Confusing it with the 'law of definite proportions' (constant composition).
- Mispronouncing 'proportion' with stress on the first syllable (/ˈprəʊpɔːʃ(ə)n/).
Practice
Quiz
The law of multiple proportion is most closely associated with which scientific concept?
FAQ
Frequently Asked Questions
It is primarily credited to John Dalton, who formulated it in the early 1800s based on the work of chemists like Jeremias Richter.
Carbon and oxygen form carbon monoxide (CO) and carbon dioxide (CO2). For a fixed mass of carbon, the mass of oxygen in CO2 is double that in CO, a simple 1:2 ratio.
The law of definite proportions states that a given compound always contains the same elements in the same fixed mass ratio. The law of multiple proportion compares the different fixed ratios formed when the same two elements make different compounds.
It holds precisely for stoichiometric compounds. Non-stoichiometric compounds (e.g., some metal oxides) show variable composition and are exceptions.