Hydrometers

Part of speech: noun

Definitions

1. An instrument used for measuring the density or specific gravity of liquids, providing valuable information about their composition
2. A device that determines the buoyancy of a liquid, which can indicate its concentration or purity
3. A tool employed in various fields, such as chemistry and brewing, to assess liquid properties based on displacement or floatation principles

Etymology: "Hydrometers" is the plural of "hydrometer", and the word is a plain technical compound: "hydro-", from Ancient Greek "hudor" meaning water, joined to "-meter", from Ancient Greek "metron" meaning measure. The second part reached English through French "-metre", so the instrument's name simply says what it does: it measures water, or more precisely, the water-based liquid it is dropped into. The pattern is the same one behind thermometer, barometer and speedometer, all built from Greek roots in the modern era to name new instruments. The "-meter" element is among the most productive scientific suffixes in English, and "hydrometer" follows the same logic, giving the instrument a name that describes its job rather than its inventor or its appearance.

Synonyms: density meters