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We have been observing that air is invisible. Yet, you can see air in several different ways:
a. You can blow through a straw into a large jar or aquarium of water and watch the bubbles coming from the end of the straw.
If you fill a glass with water and invert it in an aquarium, you can blow bubbles and catch them in the glass.
b. You can fit a rubber tube over the end of a glass funnel, hold the funnel upside down on the bottom of an aquarium filled with water, and blow air into the tube to slowly force the water out of the funnel.
You will be able to "see" the air pushing the water out. This is really seeing what air can do, rather than seeing the air, isn't it?
c. Quickly submerge an empty soda pop bottle, top up, in a large jar or aquarium of water. As the air bubbles from the "empty" bottle rise through the water, you will realize that the bottle was not really empty but was filled with a gas that we call air. The air was invisible until we exposed it to water.
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