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Experiment to find the specific heat capacity of an aluminium block.

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Introduction

Experiment to find the specific heat capacity of an aluminium block. DATA COLLECTION: Mass(m) (kg) (5dp) Current(I) (A) (2dp) Voltage (V) (2dp) Time(t) (s) (0dp) Initial temp(T1) (�C) (2sf) Final temp(T2) (�C) (2sf) +/-( 5*10^ -4) % +/- (1*10^ -1) % +/- (4*10^ -2) % +/- (5*10^-1)s +/- 0.5 �C +/- (5*10^ -1) �C 0.99577 3.70 12.07 0 16.0 16.0 0.99577 3.70 12.08 60 16.0 18.0 0.99577 3.68 12.10 120 16.0 20.0 0.99577 3.66 12.11 180 16.0 22.0 0.99577 3.68 12.10 240 16.0 25.0 0.99577 3.64 12.08 300 16.0 27.0 0.99577 3.64 12.08 360 16.0 30.0 0.99577 3.65 12.03 420 16.0 33.0 DATA PROCESSING AND PRESENTATION: As Q=m.c.(T2-T1) Where Q= energy transfer C= specific heat capacity We can rearrange this to give: C= Q/(m(T2-T1)) ...read more.

Middle

Q/m (j/kg) Errors(J/kg) Final temp(T2) ( �C) (2sf) (Q) (J) (0dp) (0dp) (0dp) (0dp) +/- (5*10^ -1) �C 0 +/- 0 0 +/- 0 16.0 2682 +/- 27 2693 +/- 30 18.0 5343 +/- 32 5366 +/- 30 20.0 7978 +/- 36 8012 +/- 40 22.0 10687 +/- 41 10732 +/- 40 25.0 13191 +/- 46 13247 +/- 50 27.0 15830 +/- 50 16897 +/- 50 30.0 18442 +/- 55 18520 +/- 60 33.0 The errors were calculated as follows: (% error in Q) = (% error in V) + (% error in I) + (% error t) (%error in Q/m) = (%error in Q) + (%error in m) = (% error in V) ...read more.

Conclusion

It was also difficult to keep the current and voltage constant, therefore a resistor could be used to control them. It was also difficult to make sure you took all the readings at the same time, i.e. temperature, current and voltage at the correct time interval. Therefore, if I were to repeat the experiment, I may get a computer to measure these variables, that way the computer would not have the human error reaction times when measuring time and would be able to do a number of readings within a few milliseconds. The procedure undertaken produced fairly accurate results, as it was systematic, however the results could be improved by repeating the experiment again, therefore getting rid of any anomalies that were not picked up by doing just one experiment. Specific heat capacity of an aluminium block. ...read more.

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4 star(s)

This is a 4 star piece of work because it is very detailed with excellent scientific calculations used throughout and a good evaluation of results. The reason this is not 5 star is because some pieces of calculations are missing with no working out to show the steps. There needs to be an introduction using scientific knowledge to explain what it is about and a detailed method to explain what results will be collected. A risk assessment is needed in all experiments. Excellent results collected.

Marked by teacher Patricia McHugh 13/05/2013

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