Usage History of 'refrigerant'

The following chart shows how frequently 'refrigerant' appeared in printed materials over time. For example, the word 'refrigerant' occurred 2 times in books in 1727 and 16,923 times in 2008. From 1727 to 2008, the word 'refrigerant' was used a total of 733,284 times in books scanned by Google. See Reference: Google Ngram project.

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