How are materials classified on the basis of their appearance?explain with exampexamples
Answers
Answer:
Appearance: Different materials look different from each other. The appearance depends on colour, hardness, texture, and lustre.
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 shiny appearance are said to have lustre.
For ex: Metals like gold, silver ,copper ,aluminium ,iron are the materials having 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 a sand paper.
Examples of 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 dull appearance are said to have no lustre.
For ex: paper, wood, chalk, cotton, plastic, rubber ,cardboard etc.
Answer:
These three classifications are metallic, ceramic and polymeric. Additionally, different materials can be combined to create a composite material. Within each of these classifications, materials are often further organized into groups based on their chemical composition or certain physical or mechanical properties