Usage History of 'refractivity'

The following chart shows how frequently 'refractivity' appeared in printed materials over time. For example, the word 'refractivity' occurred 2 times in books in 1746 and 1,409 times in 2008. From 1746 to 2008, the word 'refractivity' was used a total of 69,966 times in books scanned by Google. See Reference: Google Ngram project.

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