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The Enterprise — Michael Koff

Young scientists: Caroline Murphy, at right, a Guilderland High School student in Annette Sebuyira’s Advanced Placement, college-level chemistry class, shows fifth-graders how to make density columns. Density is a measure of how much mass is contained in a given unit of volume. Lighter liquids, like ethanol or water, are less dense than heavier liquids like honey or corn syrup. The layers of liquids can be carefully stacked.