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Questions for Discussion: Density and Buoyancy: Pouring Air into Water

In this video segment, what property of air kept it trapped in the upside down cup?

Was the air pushing the water away, or was something else happening? Explain.

If you hold a cup upside down in the air, is it empty or full? Explain.

If you hold an "empty" cup right-side-up in the air, what happens to the air inside the cup? Explain.

Experiment with pouring other liquids in water. Could you pour oil or corn syrup in water the way the ZOOM cast member was pouring air?