Disappearing dishes of water
Objectives: Students describe in writing how two cases with a single difference can show cause and effect. Students use subtraction of collected data to represent visual observations. Students describe verbally how wind increases evaporation.
Materials:
Procedure:
Fill each bowl with the same carefully measured amount of water. Put plastic wrap over one and not the other. Students record in journals how much water was poured into the bowls. Which one will dry up first? Students write predictions with explanations and/or speculation. A few days later read the predictions again. Pour out the water from each into a measuring cup and compare the two amounts.
Compare the amount of water that you started with in each bowl to the amount measured at the end of the test. Subtract the second from the first and find out how much water actually escaped from the uncovered bowl. There will be more water in the covered bowl because the plastic wrap prevented circulation of air that allowed evaporation in the uncovered one.
Close:
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