Why does a scoop of ice cream float in root beer? The answers to this and other questions of youthful empirical concern surface in this unit of substance. Secret formulas, salt solutions, color layering in liquid, and other activities and demonstrations of density reinforce students' practical understanding of this important concept in the physical sciences.

About the Author

Jacquey Barber is Director of the GEMS Program and Associate Director of the Lawrence Hall of Science. Jacquey is the author of a number of GEMS publications, including: Parent Partners, 0-924886-54-4; Dry Ice Investigations, 0-924886-15-3; Crime Lab Chemistry, 0-924886-34-X; and Fingerprinting, 0-924886-41-2

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