Question

differentiate hard and soft substances give two example of both of them

Answer 1

hard substance will be rigid and connot changes it shape when the force is applied on it..whether some of the hard substance also changes there shape but still there r consider to be solid bcoz it again comes to its original shape when the force is removed
...example of hard substance in table chair duster wall...

soft substance changes there shape when the force is applied and can be drawn into any shape..

example of soft substance is dough for making chapati...

Answer 2

Hard substances have a fixed/definite shape and it does not change shape when pressure is applied to it.

Soft substances DON'T have a fixed shape as when pressure is applied to it changes its shape to make room for the matter putting pressure on it to make more space but it's volume stays the same

Hard substances: Diamonds and Bones

Soft Substances: Water and table salt