CAS PY 105 Chapter Notes - Chapter 1: Carbon-12, Coordinated Universal Time, Kilogram
Document Summary
The standard corresponds to exactly 1. 0 unity of the quantity. Base standards must be both accessible and invariable. The international system of units: in 1971, seven quantities were selected to be base quantities forming the basis of the international system of units (si). Popularly known as the metric system: scientific notation is used to express large and small quantities. It employs powers of 10: e stands for exponent of ten , prefixes are used when dealing with measurements. Significant figures and decimal places: significant figures are used in reporting final answers. If data is given with two significant figures, your final answer should only have two significant figures: final results of calculations are rounded to match the least number of significant figures in the given data. When the leftmost of the digits to be discarded is 5 or more, the last remaining digit is rounded up; otherwise it is retained as is: time has two aspects.
