Question

How do we classify materials based on their hardness? Explain.

Answer 1

Materials can be classified into two types based on their hardness - hard materials and soft materials.

(i) Materials that can be compressed or scratched easily are called soft materials.
Example: Cotton, sponge and toothpaste.
(ii) Materials that are difficult to compress or scratch are called hard materials.
Example: Stone, wood, and iron.