Why must we observe a fresh by cut surface of a meterials to see whether it is lusture or not?
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Explanation:
Surfaces not freshly cut, may have layers of deposits of dust, rust, and other substances. This might reduce the lustre of the surface.. But when it rusts, it eventually acquires a dull reddish brown coating, which does not shine at all. This might give the impression to an observer that iron is not lustrous.
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10
Answer:
Surfaces not freshly cut, may have layers of deposits of dust, rust, and other substances. This might reduce the lustre of the surface. But when it rusts, it eventually acquires a dull reddish brown coating, which does not shine at all. This might give the impression to an observer that iron is not lustrous.
Explanation:
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