Upside Down Water

WHY?

The water stays in the glass because when you take your hand away from the card, it sags a little. The pressure inside the glass is decreased just enough so that the air pressure underneath the card is pushing up with enough force to hold the water in the glass even though it is upside down. Also,the water in the glass, because of surface tension, forms a slight suction between the glass and the index card.

ASSESSMENT: Can the student communicate what they observed?

question_guy

two The student is able to communicate that air exerts pressure on the card and holds up the water.

two The student is able to communicate that something is holding the water up.

two The student is able to communicate that the card is stuck to the glass.

two The student is able to communicate that it's magic.

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Last modified: Tue Mar 3 16:49:26 PST 1998