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This investigation is aiming to show how the volume of water effects the rate of cooling,

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RESULTS & GRAPH for the investigation of the Cooling Rate of Water RESULTS Temperature(�C) RAW-expt1,2(Processed-average) Volume of Water Suface Area/Volume(higher or lower than previous) Start Temp End Temp Drop in Temp Time Taken(mins) Cooling Rate(�C/s) 10 53 37,38(37.5) 16,15(15.5) 5 3.1 15 Lower 53 41,42(41.5) 12,11(11.5) 5 2.3 20 Lower 53 40,38(39) 13,11(12) 5 2.4 25 Lower 53 46,46(46) 7,7(7) 5 1.4 30 Lower 53 46,48(47) 7,5(6) 5 1.2 35 Lower 53 47,48(47.5) 6,5(5.5) 5 1.1 40 Lower 53 47,49(48) 6,4(5) 5 1 ANALYSIS & EVALUATION Analysis From the results and graph it can be seen that as the volume of the water increases the drop in temperature decreases in 5mins so the cooling rate decreases. The graph is showing a line decreasing and at a decreasing rate, as it starts off quickly decreasing then slowing down. As shown by the line not being straight it isn't linear graph, and neither is it linear. This supports my prediction of the volume increasing while the cooling rate decreases, and I think this because there are more particles in more volume so it will take longer for more particles to lose heat than less particles. And hen this heat is given to the environment as the environment is colder so it will do from the hottest destination to the coldest. ...read more.


If I could complete this investigation again the improvements I would perform to it are doing it all in one day so temperature over days can't affect it. But the temperature may change within the one day as it changes from time to time aswell as day to day, so I would place it somewhere where the temperature is the same so it doesn't affect the end results, that place can only be a water bath. Also I would make sure the results are more accurate by stopping the stopwatch at exactly 5 mins, and if need be put it in decimals and double checking the temperature of the water. BIOLOGY PLAN-Investigating the volume of water to the rate of cooling Introduction This investigation is aiming to show how the volume of water effects the rate of cooling, so that it can be concluded what factor of the water is effecting the rate of cooling. The volume of water is the independent variable as that is being controlled by me, the dependent variable is the rate of the cooling of the water as the outcome of it depends on the volume of water and this variable is being measured. Method The apparatus was setup as firstly 40cm3 of water was taken, measured by a measuring cylinder, and poured into a beaker, this was kept at a temperature of 50�C, using a thermometer, and it was then poured into a test tube. ...read more.


Variable Table Variable Type How change/measure/control Volume of Water Independent The volume of water will be changed in each experiment from 40cm3 to 10cm3 in 5cm3 steps. This will be measured each time by a measuring cylinder and it will change the cooling rate of the water. Cooling Rate of Water dependent The outcome of this depends on the volume of the water and this will be measured every minute for 5 mins. The cooling rate is found by Temp change/Time taken. Environmental Temperature Controlled It will be done at room temp about 20� C, and this won't change dramatically but it can affect the accuracy of the results. Starting Temperature of Water Controlled In all 7 experiments I will make sure the starting temperature is 53�C each time. This will be measured by a thermometer and it will be controlled and not change to make sure it won't affect the accuracy of the cooling rates. Insulation Controlled Each time the experiment's completed it will be made sure no insulation is around the test tube other than the air around it, because this will affect the results and then it can't be concluded what from the volume of water affects the cooling rate. Surface area: volume dependent this will be measured each time the volume of water changes, as it depends on that.And it will be measured as being higher or lower than it's previous volume ...read more.

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