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Another physical properties
Some materials, like copper, are good electrical
, but others like wood, are electrical
. As the
increases, many materials expand, and when it
materials contract. If we cannot see through an object, then its is
, if light passes through it but we cannot clearly see the objects behind it, it is
and if we can clearly see through it, it is
. materials that allow liquids to filter through
them are called
, while if they do not allow liquids to go through are
or
. When materials can be used again we say they are
. Some materials are poisonous or harmful, so they are
. Iron is an example of material that reacts with oxygen, and its oxidation will result in its surface covered with
. Some materials are
because they attract iron.
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