Question

you can't usually see gases in the air. how can you observe gases without seeing them

Answer 1

We can't see gases in the air but we can observe it because when we inhale air we inhale oxygen gas but you can also give diagram of albert einstein

Answer 2

Answer:

We can’t see the gases, but we come to about their presence by the sensation they create. We can feel the blowing of the wind. We can see the objects moving around us like the movement of plants and tree leaves. Our hair gets messed up because of the slow blowing wind.

The windmills are the perfect examples of the presence of wind around us. This is how we observe the gases without seeing them.