Rockwell number

Rockwell number

 
noun Metallurgy.
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.
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Origin:
1930–35, Americanism; named after Stanley P. Rockwell, 20th-century American metallurgist
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Rockwell number is always a great word to know.
So is newton's third law of motion. Does it mean:
says that for every action there is an equal and opposite reaction
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