Class work:
Today we are reviewing the idea that density is a characteristic property of matter and a ratio of mass per volume. Get ready to make some measurements of mass and volume. These measurements will be used to calculate density of some marbles in the lumps lab in order to predict if they will sink or float in water!
Why does salt water sink under fresh water? Pretend the marbles are water molecules that you could see. Where does the salt go? The cups have the same amount of "water" in them, but which one contains more stuff a.k.a. mass? How does having a greater mass affect the density of equal volumes?
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