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Investigation finding whether sweating increases the rate at which the body cools.

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Introduction

Investigation finding whether sweating increases the rate at which the body cools Planning I am trying to find out if the body cools quicker by sweating skin or dry skin. My input variable, the factor I am changing, is the moisture of the material wrapping the evaporating water. Prediction I predict that the temperature of the wet material will fall twice as fast as the dry material. This is, if the wet material tube falls 2?c in a minute, the dry will fall 1?c in a minute. Scientific Reasoning I believe that the wet tube will reduce temperature quicker because our body has several mechanisms to change our body temperature. When the thermoreceptors in the blood detect a high temperature, impulses are sent to the effectors in the skin so that the temperature is regulated. When we are hot, our body has to try to cool down and so sweat is produced and evaporates. This effectively allows heat to be released easily, cooling the body back to the average temperature of 37?c.

Middle

* Every minute, place a thermometer into the liquid and measure the temperature to the nearest ?c. Record the results in a table. * Keep recording until the stopwatch reaches 10 minutes; at which time the water should have almost reached room temperature. * Repeat this experiment 3 times with the same equipment and measurements but new paper towels. * When removing equipment, be careful that the test tubes do not burn when picking them up, as they may still be hot. Collecting Evidence I am observing the temperature of the water in the wet and the dry test tubes. I will measure to he nearest ?c on the thermometer. I will use a stopwatch to know at what point to take the reading, every minute. To ensure my results are reliable, I will repeat the experiment 3 times so that any obvious mistakes can be recognised and corrected. I will ensure my results are precise by making sure that the test tube that is supposed to be dry is not wet at all.

Conclusion

The results may not be completely accurate, as the reading would have been taken between the scale. I have decided to measure every minute as in my quantitative prediction I have said how the temperature will change over a period of one minute. I estimated that the temperatures would be at nearly room temperature after 10 minutes. I have therefore decided to measure every minute, for 10 minutes. Preliminary experiment Time/ minutes Wet test tube temperature/ ?c Dry test tube temperature/ ?c 0 45 45 1 41 42 2 38 40 3 36 39 4 34 38 5 33 37 6 31 36 7 30 35 8 30 35 I have taken preliminaries to see if my method of working is successful. I did not take results until the water reached room temperature as this was unnecessary and would take to long. I did not start at 70?c, only at 45?c so I know that the water would evaporate slower that that of higher starting temperature. I found my method successful. It is already apparent that the wet material allows cooling quicker. Jade Underdown 10T 03/05/07 1/3

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