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Publicado: 12 de marzo de 2013
Holy Trinity College
IGCSE Biology
“Temperature control in mammals”
05/05/2012
Introduction:
Birds and mammals maintain a constant body temperature that does notvary to external temperatures. This is important to ensure that their enzymes are kept at the optimum temperature so that they work to maximum efficiency. Any variation of the body temperaturelowers the efficiency of enzymes. This experiment measures heat loss from glass beaker, and shows how this rate of heat loss can be varied.
This process will be tested using dry cotton as fur in mammalsand differing it with wet cotton. The hypothesis is that temperature varies when water is covered by wet and dry cotton. For this hypothesis we have two predictions, the first one is that temperaturewill vary in lower ranges when water is covered by dry cotton. While, the second prediction is that temperature will vary in higher ranges when water is covered by wet cotton.
Materials:
• Timer• Water
• Bunsen burner
• 3 beakers
• Dry and wet cotton
• Thermometer
Method:
First it was put 500ml of water into a big beaker and using the Bunsen burner, it washeated to 90’c. The control beaker was labeled as A. Then, a cotton wool was wrap around a 200ml beaker and that beaker was labeled as beaker B. And to the final beaker, a wet in water wool was wrapedaround it,labeling it as C.
150 ml of heated water were poured into each of the beakers. After that, the temperature of the water at the beginning of the experiment was taken and then taken againevery 2 minutes during a period of 20 minutes.
Results:
Conclusion:
As it can be seen in the graph, in the control beaker that was without cotton the temperature went from 80.1ºc to48.4ºc in 20 minutes.
On the other hand, when water was covered with dry cotton it can be seen that the temperature of the water changed less with a range of 80.8ºc at minute 2 to 52.3ºc after 20...
IGCSE Biology
“Temperature control in mammals”
05/05/2012
Introduction:
Birds and mammals maintain a constant body temperature that does notvary to external temperatures. This is important to ensure that their enzymes are kept at the optimum temperature so that they work to maximum efficiency. Any variation of the body temperaturelowers the efficiency of enzymes. This experiment measures heat loss from glass beaker, and shows how this rate of heat loss can be varied.
This process will be tested using dry cotton as fur in mammalsand differing it with wet cotton. The hypothesis is that temperature varies when water is covered by wet and dry cotton. For this hypothesis we have two predictions, the first one is that temperaturewill vary in lower ranges when water is covered by dry cotton. While, the second prediction is that temperature will vary in higher ranges when water is covered by wet cotton.
Materials:
• Timer• Water
• Bunsen burner
• 3 beakers
• Dry and wet cotton
• Thermometer
Method:
First it was put 500ml of water into a big beaker and using the Bunsen burner, it washeated to 90’c. The control beaker was labeled as A. Then, a cotton wool was wrap around a 200ml beaker and that beaker was labeled as beaker B. And to the final beaker, a wet in water wool was wrapedaround it,labeling it as C.
150 ml of heated water were poured into each of the beakers. After that, the temperature of the water at the beginning of the experiment was taken and then taken againevery 2 minutes during a period of 20 minutes.
Results:
Conclusion:
As it can be seen in the graph, in the control beaker that was without cotton the temperature went from 80.1ºc to48.4ºc in 20 minutes.
On the other hand, when water was covered with dry cotton it can be seen that the temperature of the water changed less with a range of 80.8ºc at minute 2 to 52.3ºc after 20...
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