A unit on measurement is an excellent back-to-school science unit for elementary and middle school students. Students measure the density of water and compare it to rubbing alcohol and sugar water. The activity can be run in an inquiry fashion if you don’t tell students that the density of water is equal to 1.0; let them discover this for themselves! The materials, procedure, and result tables are provided for students to incorporate into their notebooks. Sample data is included as is an activity worksheet for afterwards.
You also get a bonus activity/worksheet where students compare the density of very warm and ice-cold water.
IMPORTANT: There is simpler version of this experiment for elementary and beginning middle school students at: Mass of 100 ml
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