sulphur dioxide: meaning, definition, pronunciation and examples
LowTechnical/Scientific, Academic, Regulatory
Quick answer
What does “sulphur dioxide” mean?
A toxic, colourless gas with the chemical formula SO₂, produced by burning sulphur or certain industrial processes.
Audio
Pronunciation
Definition
Meaning and Definition
A toxic, colourless gas with the chemical formula SO₂, produced by burning sulphur or certain industrial processes.
A significant industrial chemical and atmospheric pollutant, involved in acid rain formation and used as a food preservative (E220) and in winemaking.
Dialectal Variation
British vs American Usage
Differences
Spelling: British 'sulphur', American 'sulfur'. The chemical formula SO₂ and pronunciation are identical. The British spelling is increasingly influenced by the IUPAC standard 'sulfur' in scientific literature.
Connotations
Identical in both varieties. Connotes industrial pollution, acid rain, and public health alerts.
Frequency
Equal frequency in relevant technical and environmental contexts. The American spelling 'sulfur dioxide' is becoming more common globally in scientific writing.
Grammar
How to Use “sulphur dioxide” in a Sentence
NOUN + VERB (Sulphur dioxide rises/causes/forms)VERB + NOUN (to emit/measure/reduce sulphur dioxide)ADJECTIVE + NOUN (atmospheric/industrial sulphur dioxide)Vocabulary
Collocations
Examples
Examples of “sulphur dioxide” in a Sentence
verb
British English
- The power station will be fitted with scrubbers to **desulphurise** the flue gases, removing sulphur dioxide.
American English
- New regulations require plants to **scrub** sulfur dioxide from their emissions.
adjective
British English
- The **sulphur-dioxide-laden** air contributed to the smog event.
American English
- They monitored **sulfur-dioxide** levels near the refinery.
Usage
Meaning in Context
Business
Discussed in reports on environmental compliance, carbon trading, and industrial operational costs.
Academic
A key term in environmental science, chemistry, and public health research, particularly regarding acid deposition and air quality standards.
Everyday
Mentioned in news about pollution, air quality alerts, and occasionally on food labels (e.g., 'contains sulphites').
Technical
Precise term in chemical engineering, atmospheric monitoring, emissions reporting, and food technology.
Vocabulary
Synonyms of “sulphur dioxide”
Neutral
Vocabulary
Antonyms of “sulphur dioxide”
Watch out
Common Mistakes When Using “sulphur dioxide”
- Misspelling: 'sulpher dioxide', 'sulphurdioxide' (should be two words or a hyphenated compound).
- Confusing it with carbon dioxide (CO₂) in casual speech.
- Using it as a countable noun (e.g., 'a sulphur dioxide') – it is generally uncountable.
FAQ
Frequently Asked Questions
No. Sulphur dioxide (SO₂) is a gas. Sulphites are salts derived from it (e.g., sodium sulphite), often used as preservatives. In food, 'contains sulphites' usually indicates the presence of sulphur dioxide or its derivatives.
'Sulfur' is the standard spelling recommended by the International Union of Pure and Applied Chemistry (IUPAC) and is dominant in American English. 'Sulphur' is the traditional British spelling, though it is increasingly being replaced by 'sulfur' in scientific contexts globally.
Yes. In controlled amounts, it is used as a preservative (E220) in dried fruits and wine to prevent spoilage. It is also a crucial intermediate in the production of sulphuric acid, one of the most important industrial chemicals.
The primary anthropogenic sources are the burning of fossil fuels (especially coal and oil) in power stations and industrial facilities, metal smelting, and emissions from ships and locomotives.
A toxic, colourless gas with the chemical formula SO₂, produced by burning sulphur or certain industrial processes.
Sulphur dioxide is usually technical/scientific, academic, regulatory in register.
Sulphur dioxide: in British English it is pronounced /ˌsʌl.fə daɪˈɒk.saɪd/, and in American English it is pronounced /ˌsʌl.fɚ daɪˈɑːk.saɪd/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think of a match: the 'sulphur' smell when you strike it, and 'di-oxide' meaning two oxygen atoms. It's the bad gas from burning that smells like a struck match.
Conceptual Metaphor
POLLUTION IS A POISON / INDUSTRY IS A SMOKESTACK
Practice
Quiz
What is the primary environmental concern associated with high atmospheric concentrations of sulphur dioxide?