## Trial 2 - Accurately predicting water temperature- Remember that the pet store manager added a liter of water to the fish tank. Consider what would have happened to the tank temperature if the manager had added 10 liters of cold water instead of 1 liter. Consider what would have happened if only a drop of cold water was added. Do you think the amounts of water involved are important? Explain.
Yes No - Now you will mix known amounts of ice water and warm water using film canisters to see what effect water amounts have on temperature. Fill a large foam cup with ice water. Label this cup 1.
- Fill another large foam cup with warm water. Label this cup 2.
- Label a third large cup 3.
- You can use film canisters, filled to the top, to measure the amount, or volume, of water. Label one film canister 1 and the other canister 2. You can use film canister 1 to get ice-cold water (no ice) from cup 1 and film canister 2 to get warm water from cup 2.
- Connect the temperature sensor to the computer. Refer to Technical Hints to connect the
temperature sensor. Measure the temperatures of cup 1 and cup 2, and record the temperatures in the following table. Refer to Technical Hints to record a single
measurement.
Mixture 1:**Cup 1 temp****Cup 2 temp** - Now try mixing equal amounts of water. Pour one film canister of ice water into cup 3. Pour one canister of warm water into cup 3.
- How many canisters did you add from cup 1 and cup 2? How many canisters are in cup 3? Record these volumes in the table.
Mixture 1:**Cup 1 volume (# of canisters)****Cup 1 temp****Cup 2 volume (# of canisters)****Cup 2 temp****Cup 3 volume (# of canisters)** - Make a prediction. What do you think the temperature of the water is in cup 3? Record your prediction in the table.
Mixture 1:**Cup 1 volume (# of canisters)****Cup 1 temp****Cup 2 volume (# of canisters)****Cup 2 temp****Cup 3 volume (# of canisters)****Cup 3 predicted temp** - Use the temperature sensor to measure the actual temperature in cup 3, and record the temperature in the table.
Mixture 1:**Cup 1 volume (# of canisters)****Cup 1 temp****Cup 2 volume (# of canisters)****Cup 2 temp****Cup 3 volume (# of canisters)****Cup 3 predicted temp****Cup 3 actual temp** - How did the actual results compare to your prediction?
- With a partner try some of your own experiments. First, using the temperature sensor measure the temperature of the water in cup 1 and cup 2, then mix a chosen number of canisters from the ice-cold water and the warm water into cup 3. Complete the table as you go. Before you measure the temperature in cup 3, make your prediction.
Mixture 2:**Cup 1 volume (# of canisters)****Cup 1 temp****Cup 2 volume (# of canisters)****Cup 2 temp****Cup 3 volume (# of canisters)****Cup 3 predicted temp****Cup 3 actual temp** Mixture 3:**Cup 1 volume (# of canisters)****Cup 1 temp****Cup 2 volume (# of canisters)****Cup 2 temp****Cup 3 volume (# of canisters)****Cup 3 predicted temp****Cup 3 actual temp** Mixture 4:**Cup 1 volume (# of canisters)****Cup 1 temp****Cup 2 volume (# of canisters)****Cup 2 temp****Cup 3 volume (# of canisters)****Cup 3 predicted temp****Cup 3 actual temp** - Look at the table with your group members. Do you see a pattern? Explain.
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