A piece of metal was weighed on a laboratory balance five times and gave the following values: 15.75, 15.73, 15.77, 15.76 and 15.74 grams. Determine the average mass and standard deviation from the mean mass. (b) An object weighs 0.0930 grams on an analytical balance. Indicate the accuracy of the balance and the number of significant figures in this weight.

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Units and Dimensions

Dimensions are the basic concepts of the measurement of quantities. Units are the means of expressing the dimensions. For instance, an area has a dimension of L2 and a unit of m2.