As pressure increases, so does the rate of flow. The pressure of water is greatest at the bottom of a collection of water, and least at the top. This principle will be illustrated as students conduct the activity in this lesson. The volume of water is not a factor in determining water pressure, only height. Students predict what they think will happen.
Students enter prediction in journal.
Pass out materials and explain activity to test prediction. Set class standards for measurement and have students enter in journal. Have teams prepare pop bottle by punching 4 holes with push pin at determined intervals in bottle and leaving the pin in each hole. Fill carton to top with water. Place bottle on book or other object for elevation.