Tissue In Glass

WHY?

Although it is invisible, air occupies the space inside the cup. Water cannot get into the same space so the tissue remains dry.

ASSESSMENT: Can the student communicate what they observed?

question_guy

four The student is able to communicate that two objects cannot occupy the same space.

three The student is able to communicate that air fills up the glass.

two The student is able to communicate that something is keeping the tissue dry.

one The student is able to communicate that the tissue doesn't get wet.

EXTENSIONS:: 1. Use 2 plastic glasses. Completely submerge one in an inverted, vertical position.(It will be filled with air.) Submerge the second glass, filling it with water. Hold it in the inverted position, above and slightly to the side of the first glass. Tip the first glass to release the air. Catch the air bubbles in the water filled glass. Observe what happens. (The trapped air forces the water out because it cannot occupy the same space.)

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Last modified: Sun Aug 10 18:00:59 PDT 1997