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How do Colours and Radiation Affect theRate of Cooling of Tap Water?

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How do Colours and Radiation Affect the Rate of Cooling of Tap Water? Aim: To investigate radiation and the rate at which it cools ordinary tap water according to the colour of insulation. Apparatus needed: * Several Standard 250ml glass beakers (to be replaced after each test) * A kettle (to heat the water) * A square of bubble-wrap (to sit under the beaker to insulate it from the floor) * A Thermometer * A stopwatch * Safety Goggles (due to handling very hot water) * The materials I will use to encourage radiation are: Silver Foil Black Paper White Paper Method: 1/ After setting the equipment up, as shown. Apply safety goggles and use the kettle to boil water 2/ Pour 250ml of boiled water carefully into the beaker. 3/ Once the temperature of the solution has reduced to 80?c, begin timing. 4/ At each minute record the new temperature of the water in ?c. 5/ Record each minute for 10 minutes. ...read more.


The black stripes on the zebra absorb heat and therefore create an area of low density, low pressure air. The white stripes however have the opposite affect. It is this minute change in pressure, which is thought to cause a micro-wind running across the surface of the zebra, hence cooling the animal down in the high temperatures of the African savannah. Regarding my test, my prediction is as follows: black paper will increase the rate of cooling, the heat will be drawn out of the water quicker with black paper. Silver Foil will prove to be the best insulator, as heat will be reflected back in by the metallic silver of the foil. * To test my prediction, I decided to run a few preliminary tests. These would test whether my prediction was accurate, noticeable or worth doing. I also decided on volumes of water to use, and an appropriate starting temperature. After making my initial method better I set out my final method. ...read more.


Both the graph and results clearly back up my prediction, the black insulation drew heat out of the water, whilst the silver foil reflected heat back in, hence the water losing less heat. My results also clearly support the theory used in my prediction. 'Black absorbs heat and silver/white reflects it.' * I feel the outcome and the experiment in its entirety was a successful one. My results provide clear conclusions without any anomalies. This I feel was due to the simplicity in which I laid out my methods, which was made easier my successful preliminary tests. My results were very accurate, but, these could be made even more accurate by the use of technology, for example, using a temperature controlled room, electronic thermometers backed up with computer timing would make the results infallible. The next step to take to prove the reliability of my findings would be to set up some fieldwork regarding radiation affects in the wild. As mentioned on Zebras in my prediction. If I were to attempt this experiment again I would draw up a different method. In this new method, instead of measuring temperature difference over a 10 minute period, I will measure timings in a 20?c range. ...read more.

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