Usage History of 'humidify'

The following chart shows how frequently 'humidify' appeared in printed materials over time. For example, the word 'humidify' occurred 2 times in books in 1689 and 824 times in 2008. From 1689 to 2008, the word 'humidify' was used a total of 23,306 times in books scanned by Google. See Reference: Google Ngram project.

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