Air is all around us,

but we can't see it.

How do we know it is there?

We can see what air does.

Moving air is called wind.

Wind moves plants.

Wind moves dirt.

Strong winds can move heavy things.

Strong winds can even move a house.

We can weigh air.

We can weigh two balloons.

The one with more air weighs more.

We can see what air does.

We can weigh air.

Then, we know air is there.

Leslie, L. & Caldwell, J. (1995). Qualitative Reading Inventory-II. New York, NY; Addison Wesley Longman Publishers.