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Objects around us are made up of a large variety of materials.
nn nn n A given material could be used to make a large number of objects. It is also possible that an object could be made of a single material or of many different types of materials.
n n n n n Different types of materials have different properties.
nn n n n Some materials are shiny in appearance while others are not. Some are rough, some smooth. Similarly, some materials are hard, whereas some others are soft.
n n nn n Some materials are soluble in water whereas some others are insoluble.
n n nn n Some materials such as glass, are transparent and some others such as wood and metals are opaque. Some materials are translucent.
n n nn n Materials are grouped together on the basis of similarities and differences in their properties.
nn n n n Things are grouped together for convenience and to study their properties.
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