Metals can react with water, acid and oxygen. The reactivity of the metal determines which reactions the metal participates in. Watch this video to see a practical investigation into the ...

On comparing together the loss of weight f metal in the fresh water, sea water ... only a dight tinge of a greenish infusion can be de--ectedj a sure indication of the scarcity of oxygen.

Low- and high-frequency tags work better on products with water and metal. In fact, there are applications in which low-frequency RFID tags are embedded in metal auto parts to track them. Radio waves ...