Question

Materials are grouped for convenience; study their properties and their uses

Answer 1

Answer:

Some materials such as glass, are transparent and some others such as wood and metals are opaque. Some materials are translucent. Materials are grouped together on the basis of similarities and differences in their properties. Things are grouped together for convenience and to study their properties.

Explanation:

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Answer 2

Answer:

Some materials such as glass, are transparent and some others such as wood and metals are opaque. Some materials are translucent. Materials are grouped together on the basis of similarities and differences in their properties.