Usage History of 'hydrometer'

The following chart shows how frequently 'hydrometer' appeared in printed materials over time. For example, the word 'hydrometer' occurred 4 times in books in 1730 and 8,183 times in 2008. From 1730 to 2008, the word 'hydrometer' was used a total of 285,556 times in books scanned by Google. See Reference: Google Ngram project.

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