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Question

How can you classify material based on its appearance? Give one example each

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Solution

On the basis of their appearance, all the materials are classified into two groups:

(1) Materials having lustre or Shiny appearance

(2) Material having no lustre or dull appearance

  • Those materials which have a shiny appearance are said to have lustre.

For example Metals like gold, silver, copper, aluminium, iron are materials having a shiny appearance

Some metals like iron, copper, aluminium often lose their shine and appear dull due to the action of air and moisture on their surface. We should look for lustre only on the freshly cut surface of such metals or after rubbing their surface with sandpaper.

Examples of the material having lustre or shine are metals such as gold , silver, copper, aluminium and iron, metal alloys such as steel, stainless steel, brass, and diamond.

  • Those materials which have a dull appearance are said to have no lustre.

For example paper, wood, chalk, cotton, plastic, rubber, cardboard, etc.


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