air-hardening

[air-hahr-dn-ing]

air-hard·en·ing

[air-hahr-dn-ing]
adjective Metallurgy.
noting any metal, especially alloy steel, that can be hardened from above its transformation point by cooling in air.

Origin:
1905–10
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Air-hardening is always a great word to know.
So is law of periods. Does it mean:
says body remains at rest or in motion with constant velocity unless acted upon by external force
says square of period of any planet is proportional to cube of semimajor axis of its orbit
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