Students came into science class today to find a can of pepsi and a can of diet pepsi swimming in an otherwise empty fish tank. We discussed and demonstrated why the pepsi sank to the bottom, while the diet pepsi floated to the surface. It all has to do with their relative densities. Since water has a density of 1 g/mL, any object with a density greater than 1 g/mL will sink in water. All objects with a density less than 1 g/mL will sink in water. Since both cans have the same volume (take up the same amount of space), the difference must be in their masses. It turns out that pepsi has a mass that is 17 grams more than that of the diet pepsi. That makes the pepsi more dense than the diet pepsi, and more dense than the water, causing it to sink.
We then used the student responders to take an online practice quiz on density mass and volume. Tomorrow we will cover graphing, our last topic of this chapter
There is no assigned homework, and the test is on Wednesday, September 29th.
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