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Fig. Experiment to show that air & moisture are necessary for corrosion.

                   4.  Prevention of Corrosion-
                       Corrosion  can be prevented by various methods where, the metal is
                       prevented from coming in contact with air & moisture or by Alloying.

                       Methods of preventing Corrosion-
                       a.  Painting
                       b.  Greasing.
                       c.  Galvanizing
                       d.  Electroplating
                       e.  Alloying.
                       f.  Anodizing.



                     RANCIDITY-
                       When the substance containing oils and fats are exposed to air they get
                       oxidized and become rancid due to which their smell, taste and
                       colourchange. This process is known as Rancidity.
















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