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Weigh two dishes and record the weight of each. Place six mothballs in one dish. Weigh the dish with the mothballs in it, then determine the weight of the mothballs by sub- tracting the weight of the dish from the total weight.

Place some camphor in the second dish, and determine its weight in the same way.

Set the two dishes near a sunny window ledge. Weigh each dish every day at about the same time. Keep a record of the weights, and locate the weights on a graph.

What do you think any change in weight might indicate?

Our brilliant scientist explains that heat (in this case, the heat comes from the sunny window) can break solid objects into tiny particles that cannot be seen, yet are diffused and may be detected by the sense of smell. The diffusion of the particles relates to the Brownian Movement.

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