THE measurement of the electrical resistance of films of copper oxide on copper showing interference colours of the first order has given results varying from 0.002 to 15 ohms per sq. cm. at 25° C. On ...
FILE PHOTO: Police stand guard outside a copper smelter controlled by London-listed Vedanta Resources in Thoothukudi in the southern state of Tamil Nadu, India, May 28, 2018. REUTERS/Sudarshan ...
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