Usage History of 'acids'

The following chart shows how frequently 'acids' appeared in printed materials over time. For example, the word 'acids' occurred 14 times in books in 1664 and 587,974 times in 2008. From 1664 to 2008, the word 'acids' was used a total of 21,332,236 times in books scanned by Google. See Reference: Google Ngram project.

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