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AIM: To study Newtons second law of cooling.

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Introduction

- Newton's Second Law of Cooling DATE: 19th July 2008 IB TOPIC: SSC 9.1.2 ASSESSMENT CRITERIA: Data Collection and Processing, Conclusion and Evaluation Data collection and processing Aspect Marks awarded Recording raw data Processing raw data Presenting processed data Total Conclusion and evaluation Aspect Marks awarded Concluding Evaluation procedures Improving investigation Total AIM: To study Newton's second law of cooling. THEORY: Newton's Law of Cooling states that the rate of change of the temperature of an object is proportional to the difference between its own temperature and the ambient temperature (i.e. the temperature of its surroundings). APPARATUS REQUIRED: Three beakers of different volume and different sizes, water, thermometer, stop watch, burner, measuring cylinder. ...read more.

Middle

The table shows the fall in temperature of water in the three beakers over a period of ten minutes. Graph for the fall in temperature in the first beaker over a period of time. This is the graph of the fall in temperature of water when it is kept in the first beaker. We can clearly notice that the temperature falls very slowly while the water is kept in this beaker. Graph of fall in temperature in the second beaker over a period of time. This graph shows the fall in temperature of water over a period of ten minutes while kept in the second beaker. This graph clearly states that the water cools faster than in the first beaker. ...read more.

Conclusion

* The water in the beaker with the largest surface area cooled the fastest. * Therefore, as the surface area increases, so does the heat loss. EVALUATION: Possible sources of error * There was a deep dive in the readings for the third beaker for a minute which might have been due to the fan being on or due to wind blowing in through the open window. * These could be possible sources for any other errors too. * Also the fault in the readings could be due to a human error. * The fall in temperature might not have been very steady due to the change in the surrounding temperature. Possible areas for improvement * The fan should not be on while the experiment is being conducted and their should be no other form of air flow. ?? ?? ?? ?? Candidate name: Shwetank Rastogi Candidate session number: ...read more.

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