Usage History of 'phosphor'

The following chart shows how frequently 'phosphor' appeared in printed materials over time. For example, the word 'phosphor' occurred 2 times in books in 1656 and 16,628 times in 2008. From 1656 to 2008, the word 'phosphor' was used a total of 585,789 times in books scanned by Google. See Reference: Google Ngram project.

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