hydrometer
LowTechnical/Specialist
Definition
Meaning
A device for measuring the density or specific gravity of liquids.
A glass or plastic instrument, typically with a weighted bulb and a graduated stem, used to determine the concentration of dissolved substances (like sugar in winemaking or alcohol in spirits) or the state of charge in a battery acid by how high it floats in a liquid.
Linguistics
Semantic Notes
The term is hyponymous; specific types include saccharometer (for sugar), alcoholometer, lactometer (for milk), urinometer. It is a tool, not a process.
Dialectal Variation
British vs American Usage
Differences
No significant spelling or meaning differences. The device and its applications are identical. Terminology in associated fields (e.g., 'specific gravity' vs. 'relative density') may show minor regional preference but not tied to the word itself.
Connotations
Purely technical and neutral in both varieties.
Frequency
Equally low-frequency and specialised in both regions, used primarily in scientific, industrial, brewing, and automotive contexts.
Vocabulary
Collocations
Grammar
Valency Patterns
[Verb] + hydrometer: use, read, calibrate, immerse[Adjective] + hydrometer: standard, floating, precision[Noun] + hydrometer: battery, brewing, laboratoryVocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “None”
Usage
Context Usage
Business
Used in quality control labs in beverage, chemical, or battery manufacturing.
Academic
Common in chemistry, physics, food science, and engineering laboratory manuals and experiments.
Everyday
Virtually never used in casual conversation. Known to home brewers, wine makers, or mechanics testing car batteries.
Technical
The primary register. Precise term for the instrument in manuals, specifications, and procedural texts.
Examples
By Part of Speech
verb
British English
- The brewer will hydrometer the wort to check the sugar content.
American English
- The technician needs to hydrometer the electrolyte in each cell.
adjective
British English
- The hydrometer reading was essential for the experiment.
American English
- We followed the standard hydrometer method outlined in the manual.
Examples
By CEFR Level
- The scientist put the hydrometer into the liquid to measure it.
- For an accurate specific gravity reading, ensure the hydrometer is clean and floating freely in the sample.
- Calibrating the hydrometer against a standard solution of known density is a prerequisite for precise analytical work.
Learning
Memory Aids
Mnemonic
HYDRO (water/liquid) + METER (measure) = a device to measure liquids.
Conceptual Metaphor
A FLOATING RULER FOR LIQUIDS (its operation relies on buoyancy and marked gradations).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with 'гигрометр' (hygrometer - measures air humidity).
- May be translated as 'ареометр' (areometer), which is a direct synonym.
- Beware of false cognate 'гидрометр' which typically refers to a hydrological measuring complex for weather/water flow, not liquid density.
Common Mistakes
- Misspelling as 'hydrometre' (UK spelling is also '-meter').
- Confusing it with a 'hygrometer'.
- Using it as a verb (e.g., 'I need to hydrometer the solution' - incorrect).
Practice
Quiz
What does a hydrometer primarily measure?
FAQ
Frequently Asked Questions
A hydrometer measures liquid density (e.g., sugar in wine). A hygrometer measures humidity in the air.
In theory yes, but they are often calibrated for specific ranges of density (e.g., for battery acid, urine, alcohol, milk) and temperature. Using the wrong type can give inaccurate readings.
No. Both can estimate sugar content, but a refractometer measures how light bends in a liquid, while a hydrometer measures buoyancy. They are different instruments.
Liquid density changes with temperature. Most hydrometers are calibrated for a specific temperature (e.g., 20°C/68°F). Readings must be corrected if the sample is at a different temperature.