Question

ice water and steam are three states of a substance and not different substance why

Answer 1

Just because the molecules are same but there's a difference only in the spaces between them
I think that's the answer
hope it helps

Answer 2

ice water and steam are three states of a matters and not different substances because the molecule of water is same in both cases but only it is physical change. Only there intermolecular force of attraction and intermolecular space changes