Thursday, November 13, 2008

Determining Density

During the past week, we have been learning about Density. The topic is challenging because Density isn't just on thing, but the relationship of two things, mass per unit volume. The students have massed various volumes of water to learn that the relationship of mass to volume in water is 1g : 1ml. Therefor, the Density of fresh water is 1.0 g/cm3. The kids have done some Density word problems for homework and in class, found the Density of various objects by massing them and then determining their volume by displacement. Then, using the formula D=M/V, the kids determined the Density. Answers were rounded off to the nearest 0.01 and the label is grams per cubic centimeter, (g/cm3). Answers were recorded on a data chart.

The kids have used three different types of balance scales: pan balance scale, triple-beam balance scale, and an electric pan balance scale.

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