Density of soap

Images from laboratory one which explored the density of soap. Harmony beauty soap with a density greater than one gram per cubic centimeter was used along with Ivory® Aloe soap with a density of less than one gram per cubic centimeter.

Jessica carves soap into a rectangular slab to permit a simple calculation of the volume using the length times the width times the height of the soap slab.

Cecelia has finished cutting a slab. Early in the laboratory the students are asked to predict whether each type of soap will float or sink in water. This is then demonstrated. Later this is linked to the slope, which is the density, being greater or less than one.

The slabs have to massed. Marla assists Stacy on massing a soap slab. The soap is cut into slabs of different sizes to generate five pairs of volume and mass data.

Later, in the computer lab, the students enter the data into a spreadsheet and perform a linear regression. The slope of the volume versus mass line is the density of the slope.

Nancylynn assists another student in the computer laboratory.

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