PHYS 1300 Chapter Notes - Chapter 1,2: Roundoff, Significant Figures, Caesium
14 Dec 2016
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A standard unit is one that can be reproduces according to its definition and does not change (always the same no matter who"s using it: this is the world"s metric system/british imperial system. Derived units: a measurement that can be stated in terms of one or more base units (example a square metre) Metric prefixes: based on multiples of ten but are just prefixes, can be found inside the front cover of the textbook. Measured quantities always have uncertainty, scientists use a range to determine how much it is a possible lie (decimals) Is the accepted value of measurement is known the percent error can be calculated: percent error = ( |measured value accepted value| / accepted value ) x 100% When multiplying or dividing measured quantities all numbers should be rounded to have the same significant digits as the number with the least significant digits.
