Usage History of 'hydrogel'

The following chart shows how frequently 'hydrogel' appeared in printed materials over time. For example, the word 'hydrogel' occurred 2 times in books in 1870 and 12,782 times in 2008. From 1870 to 2008, the word 'hydrogel' was used a total of 178,788 times in books scanned by Google. See Reference: Google Ngram project.

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