Question

What is another example, in real life, where we can prove that gases exist even though we can not see them? Explain why you believe this is a good example.

Answer 1

Well, us human being rely on
`o_(2)` (oxygen). We human beings breathe this in every day because we need it to survive. This is a good example because it explains how humans don't see
`o_(2)` but use it every day.