Usage History of 'antiprotons'

The following chart shows how frequently 'antiprotons' appeared in printed materials over time. For example, the word 'antiprotons' occurred 2 times in books in 1838 and 2,169 times in 2008. From 1838 to 2008, the word 'antiprotons' was used a total of 60,397 times in books scanned by Google. See Reference: Google Ngram project.

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