1516 Lecture Notes - Lecture 3: International System Of Units, Standard Deviation

• School: University of Canberra
• Department: University of Canberra
• Course: 1516
• Professor: Karen Altamore

Document Summary

Data was gathered for a cube of a particular substance : the weight is measured with a weighting scale and the volume with a ruler, a vernier calliper and by the volume displacement method in a measurement cylinder. The measurements were repeated 3 times to determine the average and standard deviation. The density of a substance is its mass per unit volume : A more suitable unit of measure would either be : g/cm^3 as cubes are a bit hard to measure. Since the ruler is marked every mm, we can state measurements to the mm for certain and then estimate the second number. In the case for the cube, v = 0. 9 * 0. 9 * 0. 9 = 0. 7cm^3 *1000 = 700 mm^3 with only 1 signi cant gure. A caliper has markings every 0. 1 mm, we can therefore state measurements to 0. 1mm for certain and then estimate the nal division.