isopropyl alcohol
C1Technical / Scientific / Medical
Definition
Meaning
A colourless, flammable chemical compound with a strong odour, used as a solvent and disinfectant.
A secondary alcohol, specifically the simplest example of a secondary alcohol, with the chemical formula C3H8O or (CH3)2CHOH. It is a common ingredient in rubbing alcohol, hand sanitisers, cleaning products, and industrial solvents.
Linguistics
Semantic Notes
The term is a compound noun naming a specific chemical substance. It is often used interchangeably with 'rubbing alcohol', though technically rubbing alcohol can be isopropyl or ethyl alcohol. In technical contexts, precision is required.
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences. Spelling of related terms follows regional norms (e.g., 'colourless' vs. 'colorless').
Connotations
Identical technical connotations. In everyday use, both regions associate it strongly with first aid and cleaning.
Frequency
Equally common in technical/medical contexts. Slightly more frequent in everyday American English, where 'rubbing alcohol' is predominantly isopropyl-based.
Vocabulary
Collocations
Grammar
Valency Patterns
Use [isopropyl alcohol] to [disinfect the skin].[Isopropyl alcohol] is [used as a solvent].[Dilute] the [isopropyl alcohol] with [water].Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “None. It is a technical term not used idiomatically.”
Usage
Context Usage
Business
Referenced in procurement, manufacturing (electronics, pharmaceuticals), and safety data sheets.
Academic
Used in chemistry, biology, and medical textbooks and research papers discussing solvents, disinfectants, or extraction methods.
Everyday
Common in home first aid ('Put some rubbing alcohol on it'), cleaning electronics, or DIY projects.
Technical
Precise term in laboratory protocols, industrial cleaning specifications, and pharmaceutical formulations.
Examples
By Part of Speech
verb
British English
- The technician will isopropyl-clean the contacts. (rare, non-standard)
American English
- Make sure to isopropyl-wipe the surface. (rare, non-standard)
adverb
British English
- The component was cleaned isopropyl-alcohol-quickly. (not used)
American English
- Not used as an adverb.
adjective
British English
- The isopropyl alcohol solution is ready. (compound noun modifier)
American English
- Use an isopropyl alcohol pad. (compound noun modifier)
Examples
By CEFR Level
- Isopropyl alcohol cleans cuts.
- You can buy isopropyl alcohol at the pharmacy to clean your glasses.
- Before injecting, the nurse cleansed the patient's skin with 70% isopropyl alcohol.
- The organic synthesis required anhydrous isopropyl alcohol as an aprotic solvent for the reaction.
Learning
Memory Aids
Mnemonic
Think: 'ISOlated PROpyl' – a specific (iso-) form of propyl alcohol used to ISOLATE germs by killing them.
Conceptual Metaphor
CLEANLINESS IS PURITY (it strips away dirt and germs); A TOOL/AGENT (it is used *to* achieve a clean state).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid direct translation of 'alcohol' as 'алкоголь' (which refers to beverages). The correct term is 'спирт'.
- The 'iso-' prefix denotes an isomer, not 'equal' or 'same' as in 'isometric'.
- Do not confuse with 'ethyl alcohol' (этиловый спирт).
Common Mistakes
- Pronouncing 'isopropyl' as 'eye-so-pro-pill'. Correct: 'eye-soh-pro-pil'.
- Using 'isopropyl alcohol' and 'rubbing alcohol' as exact synonyms without checking concentration or additives.
- Omitting the hyphen in writing (incorrect: 'isopropylalcohol').
Practice
Quiz
What is the primary chemical difference between isopropyl alcohol and the alcohol in beverages?
FAQ
Frequently Asked Questions
No, it is toxic and can cause severe poisoning, unlike ethyl alcohol found in beverages.
70% is more effective for disinfection because the water content slows evaporation, allowing more contact time with microbes. 99% is better for cleaning electronics where water residue is a problem.
No. It can damage plastics, acrylics, painted surfaces, and certain finishes. Always test on a small area first.
Because it evaporates very quickly, a process which draws heat away from the skin, creating a cooling sensation.