in the first lab, we started measure a rod by a ruler, digital caliper and a micrometer, at the beginning, we measured the digital mass scale of the rode. Then we compared between the three devices to know the accurate one. Then we calculated the percent uncertainty. After that, we had to measure the diameter of the rod by using the micrometer in many different places in order to get the standard uncertainty of mean. Although these calculation took long time but these date were important to complete the the activity, we found the volume and its uncertainty, also calculated the density and its uncertainty. The final result helped us to determine the substance over my calculation , i found that the rod materials was Iron because the density was 7.88 f/cm3
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