Air is an Interesting Element in the Earth

One of interesting element in the earth is AIR. Imagine if the earth don't have air like in the planet, it's impossible human can live in the earth. One air function sample is breath. When we breath we need air. Plane can't fly without air.

We can't see air without tool. But we can make an experiment to find it. When we make a bubble soap, we would confirm that air was there.