Participants test their hypothesis by using the pencil and ruler balance to determine which container is heavier. Very carefully add three tablespoons of plain water to one film canister. Very carefully add three tablespoons of corn oil to the other film canister. Repeat several times and record the results of each test. Participants determine whether or not their hypothesis was true.
Participants develop tentative explanations of what they have observed.
Supplementary Reading List Agler, Leigh. WWW References Baim, Kathy D. Molecules and Temperature. Matter and Heat. The Motion of Molecules in Water. When we used the eye dropper to place the test liquid gently first above and then below the layer of cool water this is what we saw.