A TEST TO PROVE THAT A MATERIAL IS HARDER THAN ANOTHER MATERIAL!!

If you have to materials:- Stone and a piece of foam, you can easily tell which is harder just by touching the materials, But if you have:- stone and wood, it would be difficult to tell which if harder. Than let me tell you a method which would help you to tell which material is harder!!


Materials:
Stone
Wood

Instructions

Take stone in one hand and the wood in the other hand.
Now rub them with each other. The object that does not gets scratched is said to be harder than the scratched object!!