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Physics coursework: Charles’ Law.

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Introduction

Physics coursework: Charles' Law. Height of substance (mm) Temperature (oC) Experiment 1 Experiment 2 Experiment 3 Average 20 197 199 207 201 30 202 202 212 205 40 206 207 217 210 50 209 210 221 213 60 213 212 226 217 70 216 215 228 219 80 219 218 231 223 90 223 220 234 226 100 228 223 237 229 These are the raw details, which I have taken from my experiment. I need to work out the volume for each measurement taken, as this is the point in my experiment (being in Charles' law). I am going to work out the volume of the substance under the dyed sulphuric acid. To do this I need to use the ?r2h. I measured the radius to be 0.73mm (of the capillary). I need to turn the height into mm for the equation. Table of volumes Temperature (oC) Equation (uses mm) Av. Volume (mm3) 20 ?*0.73 2*201 336 30 ?*0.73 2*205 343 40 ?*0.73 2*210 352 50 ?*0.73 2*213 357 60 ?*0.73 2*217 363 70 ?*0.73 2*219 367 80 ?*0.73 2*223 373 90 ?*0.73 2*226 378 100 ?*0.73 2*229 ...read more.

Middle

In terms of in the same experiment the largest source of error I think will be the accuracy of reading the ruler, reading it exactly at the right temperature and being level with it to read it accurately. Room temperatures and pressures would have altered during the experiment; if the experiment took place in a more controlled environment this would be minimal. An enclosed lab instead of a busy one would work better. The ruler was only fixed to the capillary by an elastic band also, this could have caused trouble as it may have moved up or down. A permanent measuring device or a digital one could have helped solve this. I think the accuracy of the measurements will be a big error so I have chosen to use error bars according to how well each measurement instrument reads what it does. In the equation for the volume I use V=?r2h in the radius I used a measuring microscope and this read to the 0.00005m and for the height I used a ruler which measured to 0.0005m, I need to add these together to get error bars for my graph. ...read more.

Conclusion

I think taking the readings to great accuracy could have been hard as I had to be level with the thermometer and the ruler to take the reading, which I could only take in the short time in which the water was at the right temperature. I think there aren't any obvious anomalies but if I'd had more time I would have done the whole third experiment again, the readings are too high compared with the others and deviate from the mean too much. I think that the repeats are not close enough to say my results is that reliable. I think all my measurements should be lower. If I were to extend the experiment I would use more reliable equipment (i.e. A better capillary tube) and I would have used thermostatically controlled water baths. I think my results would have been better if I had taken out the experiment more times, maybe I would re-think my method as the problems with it seemed to effect all my results. I think there aren't too many discrepancies between my data but my results do not support the theory of absolute zero very well. ?? ?? ?? ?? ...read more.

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