Meaning & use
hydrometer
An instrument used to measure the density or specific gravity of a liquid.
See it in a sentence
The brewer used a hydrometer to check the sugar content of the fermenting beer.
A hydrometer floats higher in denser liquids, which is how it gives its reading.
A note on using this word
Hydrometers are common in winemaking, brewing, and testing the acid in car batteries.
Words with a similar meaning
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