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My son wants you to measure the temperature of cooling liquids, record your data and plot graphs of your results. He wants you to find out what factors are important when liquid cools down. For example, does a "hot" liquid at a high starting temperature cool faster than a "warm" liquid starting at lower temperatures.
For each experiment you must choose a liquid to test, a starting temperature and the "room" temperature. Then, every time point, you must record the temperature that the liquid has reached. These results are your data.
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Your results are then plotted in the form of a graph, such as the one below.
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Investigation Questions
- How long does it take for a sample of the 'Gold' liquid to cool from 100 degrees to 15 degrees?
- How long does it take for a sample of the 'Gold' liquid to cool to 20 degrees, if it starts at 100 degrees and the room temperature is 15 degrees?
- How long does it take for a sample of the 'Gold' liquid to cool to 20 degrees, if it starts at 100 degrees and the room temperature is 5 degrees?
- Compare the results of the two experiments above. Do liquids cool faster if the room temperature is lower?
- How long does it take for a sample of the 'Gold' liquid to cool from 120 degrees to 15 degrees?
- Look at all the three graphs you have just plotted. In each case, work out the temperature half way between the starting temperature and the room temperature. (For example, if the starting temperature was 100 degrees and the room temperature was 20 degrees, half way between these two values would be, 100 - 20 = 80, then 80/2 = 40).
How long did it take, in each case, for the liquid to cool to this half way point?
- Compare the cooling curves (graphs) for two different liquids. Are they different? Why?
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