Usage History of 'invar'

The following chart shows how frequently 'invar' appeared in printed materials over time. For example, the word 'invar' occurred 2 times in books in 1704 and 1,299 times in 2008. From 1704 to 2008, the word 'invar' was used a total of 87,234 times in books scanned by Google. See Reference: Google Ngram project.

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