rockwell number

Rock·well num·ber

R r

Definition of rockwell number words

noun rockwell number a numerical expression of the hardness of a metal as determined by a test (Rockwell test) made by indenting a test piece with a Brale, or with a steel ball of specific diameter, under two successive loads and measuring the resulting permanent indentation. 1

before 1930

One of the 10% newest English words

1930-35, Americanism; named after Stanley P. Rockwell, 20th-century American metallurgist

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This term is known only to a narrow circle of people with rare knowledge. Only 2% of English native speakers know the meaning of this word.

According to our data most of word are more popular. This word is almost not used. It has a much more popular synonym.

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