Magnetism. A magnet being used to separate iron filings from fine sand. The iron filings, being a magnetic material, stick to the magnet while the sand, made of non-magnetic silica, doesn't.
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Details
Creative#:
TOP15088540
Source:
達志影像
Authorization Type:
RM
Release Information:
須由TPG 完整授權
Model Release:
No
Property Release:
No
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No
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