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Specific Heat Capacity

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Specific Heat Capacity Aim To find out what affects how quickly a substance such as water heats up Plan I am going to compare the effects of an immersion heater has on different masses of water. I will do this over a time of 3 minutes, measuring the temperature, voltage and level of amps at each different level of water. Useful Equations Q=mc( ??) Energy Supplied(J) = Mass(g) ? Specific Heat Capacity(J/Kg/ C) ? Temperature Change( C) T= mc( ??) ? Q Time (S) = Mass(g) ? Specific Heat Capacity(J/Kg/ C) ? Temperature Change( C) ? Energy Supplied(J) Electrical Energy = ItV Electrical Energy = Current(A) ? Time(S) ? Volts(V) Prediction My hypothesis is that the temperature will change at each level. I believe that the bigger the mass of water, the lower the temperature will be at the end of 3 minutes because the immersion heater is having to heat more molecules and the heat energy will be equally spread. I also believe that the voltage and level of amps will go up slightly as the mass of water rises because more energy is needed by the immersion heater to heat up the water. This has been deducted from my research that states '1 calorie is needed per degree Celsius of temperature change for 1 gram of liquid water.' ...read more.


7. Check the temperature of the water now and record it down. 8. Place the immersion heater into 100g of water and start the stopwatch for 3 minutes. 9. Record down the amp readings and the volt readings. 10. After 3 minutes, place the thermometer in the water and record down the temperature of the water. 11. Repeat experiment 4 more tomes increasing the water by 100g each time. Risk Assessment * Mind the water as it will be hot and you might burn yourself * Mind the immersion heater as it might burn yourself * Mind the water on the electric's Trial Results 3 minutes Mass Volt Amps Temp. before Temp. after 100.02g 12.87 3.98 21? 33? 201.12g 12.90 3.97 21? 31? 300.85g 12.91 3.98 21? 22? 399.97g 12.82 4.01 21? 21? 498.74g 12.88 4.03 21? 18? Changes to plan After looking at my preliminary results and having done the trial, I have decided to make a single change. From 3 minutes, I am going to let the experiment run for 5 minutes because it may be easier to get a final conclusion from the results. This is because the change in the temperature after 3 minutes is too close to the starting temperature. ...read more.


There were not any anomalous results, I reckon this is because the test was very accurate and there was a fair test made. Evaluation My method worked very effectively as it was very straightforward and I got very reliable results to enable me to evaluate my aim which was to find out what affects how quickly a substance such as water heats up. I followed my plan very well and my prediction came true, however, if I was to do it again, I would not change the mass but the voltage as I believe it would be interesting to see how it turns out. I also would use some sort of insulation as it would prevent heat loss and help the experiment to be much more accurate. If I was to re-do this experiment I would do it with solids not liquids as solids conduct heat much better then liquids do. I also think that it would produce much more accurate results. I believe that my experiment was a success but I should have used a digital thermometer. The only difficult part of this experiment was measuring out exactly the amount of water that I wanted because it will either be a tiny bit above or below. Overall I got reliable results and I fulfilled my criteria so I am happy with the results I got to prove them onto a graph. Abdul Memon Physics coursework ...read more.

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