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.