How Much Water Is in a Fruit?
Ask students to predict whether an apple contains water, and if so, whether it contains more or less water than an orange does. Have students weigh an apple, and then cut it into 1/2-cm vertical slices. The slices may be placed between layers of paper towel or threaded on a plastic straw, as shown in the illustration on this slide. Students should weigh the slices each day, until there is little or no difference in the weight from one day to the next.
Instruct students to record the results on their worksheets. Help students to plot their data on a graph.
Finally, ask students how they might determine the weight of the water in the original apple. (They can subtract the final weight of the slices from the original weight of the apple.)
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Funded by the following grant(s)
The Environment as a Context for Opportunities in Schools
Grant Numbers: 5R25ES010698, R25ES06932
Foundations for the Future: Capitalizing on Technology to Promote Equity, Access and Quality in Elementary Science Education