blister copper

blister copper

noun Metallurgy.
a matte of from 96 to 99 percent copper, having a blistered surface after smelting because of gases generated during solidification.

Origin:
1860–65
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Blister copper is always a great word to know.
So is law of periods. Does it mean:
quantity of matter as determined from its weight or from Newton's second law of motion
says square of period of any planet is proportional to cube of semimajor axis of its orbit
Collins
World English Dictionary
blister copper
 
n
an impure form of copper having a blister-like surface due to the release of gas during cooling

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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