TEEMSS 2
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All Units>Unit 6 - Water and air temperature>Investigation 1 - Temperature of mixing water>Trial 1

Trial 1 - Temperature of mixing water

  1. Obtain 1 small foam cup and 1 large one. Fill the small cup half full with cold water (ice water with no ice cubes). Put about the same amount of the warm water in the large cup.

  2. Connect the temperature sensor to the computer. Refer to Technical Hints to connect the temperature sensor. Put the temperature sensor in the small cup. Measure the temperature. When recording the temperature, wait until the temperature read by the sensor stops decreasing, then record your result. Refer to Technical Hints to record a single measurement.


    Cold Water Temperature:


  3. Repeat the process for the large cup of water, and record your results below.
    Warm Water Temperature:


  4. Make a prediction. What do you think the temperature will be when you mix the two cups of water?
    Predicted Final Temperature:


  5. How did you come up with this prediction?



  6. Pour the small cup of water into the large cup. Measure and record the temperature below.


    Actual Final Temperature:


  7. Is the temperature close to what you expected?


    Yes


    No


    Explain.


  8. Now you are going to mix two more samples of water. Pour your water out and add some hot water to the large cup. Instead of ice water, add cool water from a faucet or jug to the small cup. Using the temperature sensor, measure the initial water temperatures in each cup, and then make a prediction for a final temperature. Record your measurements and predictions in the table below.

    Small Cup
    Initial Temp (degrees C)
    Large Cup
    Initial Temp (degrees C)
    Mixture Predicted Final Temp (degrees C)


  9. When you mix the water from both cups, measure the final temperature and record your results in the table below.
    Mixture 1:
    Small Cup
    Initial Temp (degrees C)
    Large Cup
    Initial Temp (degrees C)
    Mixture Predicted Final Temp (degrees C)
    Mixture Actual Final Temp (degrees C)


  10. Try a few more mixtures. Repeat the process in Steps 8 and 9 a few times with cups of varying temperatures of water and fill in the tables under Mixture 2, 3, and 4.
    Mixture 2:
    Small Cup
    Initial Temp (degrees C)
    Large Cup
    Initial Temp (degrees C)
    Mixture Predicted Final Temp (degrees C)
    Mixture Actual Final Temp (degrees C)

    Mixture 3:
    Small Cup
    Initial Temp (degrees C)
    Large Cup
    Initial Temp (degrees C)
    Mixture Predicted Final Temp (degrees C)
    Mixture Actual Final Temp (degrees C)

    Mixture 4:
    Small Cup
    Initial Temp (degrees C)
    Large Cup
    Initial Temp (degrees C)
    Mixture Predicted Final Temp (degrees C)
    Mixture Actual Final Temp (degrees C)


  11. Look at the table with your group members. Compare the final temperatures with the initial temperatures. Do you see a pattern? Explain.



  12. Sometimes it is easier to understand data while looking at a table. At other times looking at a graph can be helpful. Try drawing a bar chart on the grid below with the Small Cup, Large Cup, and Actual Final Mixture Temperatures from the table.



  13. What seems to be true about the final water temperature in all the cases you recorded?





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