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  Since
metals are limited and the corrosion is also destroys them. We must need to find
out some methods to deal these problems, so conservation is discovered.

But how can we conserve
our metal resources? There are three ‘R’s of conservation are Reuse,
Recycle and Replace.

       
--This is a method for using the broken equipment again.

       --This is a method of recycle the used
metals and use them again. Such as melting down the metals and using them
again.

       --This
is a method to find out some materials to replace metals. For examples, we
replaced copper by plastics for      making pipes, and
by optical fibres for making telephone wires.
Manufacturers are investigating the use of plastic and ceramics for car eng
ines. 

*
It
is not so easy to find out the metals’ replacement since metals have many
benefits.

 

Used metals

    Used
metals

  Replaced materials    Advantages and disadvantages

1. Cooking pot               
 Copper                
 Glass               
   
Saves the limited materials but 

                                                                                     
    is not a good heat
conductor. 

2. Soft drink
can        Aluminum       
      Plastic        
        
Cheaper price, saves the limited 

                                                                                       
  aluminum but difficult
to dispose.

3.
Coins                     
Copper alloy        Money
notes          
Saves the limited materials and easier

                                                                                        
  to carry but also
easily to be faked.