sourse of errors occurred during the experiment listed below.It was very difficult to work with metals that had great coefficient of expansion GROUP #5like brass and aluminum. Such metal expansed very rapidly within a short period of time, and the change in length of the metal can only be appoximated. And also due to the human reaction time and human judgement, the result of the experiment data was affected. In order to reduce these source of errors, computerize thermometer and extensometer will have much efficiency and also it could produce more accurate data.During the heating process, the steam was supposed to follow the cradle (hollow metal tube) and exit from a small opening on the other end of the cradle. Since the simple hollow metal tube was not well insulated, some steam and hot water were leaking out from both sides of the rubber jacket and also though the opening for the thermometer. The results of the data were slightly affected due to heat lost.After the first specimen rod was done, the percent deviation of glass, copper, stainless steel and aluminum have increased noticeably. One of the reasons is that the metal tube was not able to return back to its original temperature or its normal state within a short period of time, even though it was cooled down by running under the water. Another factor was that the thermometer also could not return to the room temperature.ConclusionThe experiment was luckily conclused fairly similar to the accepted value. However, because only appoximation of datas and other source of errors, the accuracy of the data could be questionable....
