Q. What's the second hardest substance discovered ?
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Q. What's the second hardest substance discovered ?Heyo.. Guys !
Q. What's the second hardest substance discovered ?
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Answer:
Boron nitride
Explanation:
The synthetic material boron nitride, first produced in 1957, is similar to carbon in that it has several allotropes. In its cubic form (c-BN) it shares the same crystalline structure as diamond, but instead of carbon atoms is made up of alternately-bonded atoms of boron and nitrogen. c-BN is chemically and thermally stable, and is commonly used today as a superhard machine tool coating in the automotive and aerospace industries.
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