Question

1. How will you identify materials based on their hardness? Give examples. ​

Answer 1

Answer:

You can easily scratch some materials, while some cannot be scratched so easily. Materials which can be compressed or scratched easily are called soft while some other materials which are difficult to compress are called hard. For example, cotton or sponge is soft while iron is hard.

Answer 2

Answer:

Hardness of metals is usually done using an indented , with a "hardnessnumber" being related to the depth of the indentation. ceramics and other very hard materials are often measured using a scratch method.p, as tics and other soft materials 'hardness can be measured using rebound and other method .