


3.1.1 Parts Per Million
Materials
 12 one meter sticks (or dowels cut to one meter lengths)
 masking tape
 modeling clay
 thread
Procedure
 Construct a cube out of the meter sticks and masking tape.
 Roll out 10 to 15 small spheres of modeling clay, each approximately
one centimeter in diameter, representing ozone molecules.
 Using thread, suspend each sphere at a random location within the
cube.
 Calculate how many cubic centimeters there are in a cubic meter. Have
students express the relation of the ozone to the cubic meter or atmosphere.
(Each sphere represents one part per million of the total volume of
the cube.)
Last Update: 1/18/97
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