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To see how long it takes the size of a hot object to cool down.

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Introduction

SIZE & COOLING Aim: To see how long it takes the size of a hot object to cool down. Planning: I will make sure I devise a fair test by doing things correctly and fairly. The only variable I will be obtaining will be the temperature of the water at 80oc, and I will make sure it is fair by testing it with a thermometer. I will also make sure it is a fair test by adding more water into the bigger beakers because it wont all fit into the smaller ones so that will give the smaller beakers a fair chance as well, and I will measure the water in a measuring cylinder to make it fair. I will also make sure I devise a fair test by using a stopwatch to record the result every 30 seconds up to 2minutes, because it is more reliable and accurate. I will make sure it is fair when we record the results because when we get the temperature I will get a second opinion of my friend. I will also make sure my experiment is safe in all the possible ways I can. ...read more.

Middle

Numbers and range: In total I will have 4 results for the 4 different sized beakers and for each beaker I will have two readings, and I will record the results every 30 seconds and at the end of all the results I will take away 2 minutes from 0 seconds for the first reading of the first beaker then I will do the same to the second reading for the first beaker then I will add them both and divide them by two which will give me an overall average for the first beaker, and I will carry that on for the next 3 beakers, in the end I should end up with 4 different averages with which I will plot a graph. Here are the 4 different beakers: BEAKER 1: The biggest with 150ml of water BEAKER 2: The second biggest with 100ml of water BEAKER 3: The third biggest with 75ml of water BEAKER 4: The fourth biggest with 50ml of water Safety: I will try and make my experiment safe by firstly wearing rubber gloves in case we spill the boiling water, secondly by consulting a teacher before and after we set up the experiment. ...read more.

Conclusion

from highest temperature to lowest temperature is: beaker 2, beaker 4, beaker 1, beaker 3, so I think that because the averages have turned out like that and not how I expected which was beaker 1,2,3 and then 4, I think that the whole experiment must have went wrong from start to end. Evaluation: In my experiment I found that most of my results were quite off key, in the graphs 'result 1' and 'result 2' the orders were only one out of order. Then when it came to the graph labelled 'averages' the order was completely wrong to what I predicted, I predicted the bigger the beaker the faster it will cool, if that happened the order would have been beaker 1, 2, 3, and then 4, but because it went wrong it turned out beaker 2, 4, 1 and then 3. if you look at the graph 'result 1' the problem was beaker 4, and in the graph 'result 2' the problem was beaker 3, I don't have a clue why those problems occurred, and by looking at the average I think I could have improved my experiment by doing it all over again but much more carefully this time round. Sukhdeep Singh Kairo ...read more.

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