Lecture2-C - Chapter 2 - Measurements and Calculations...

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1 Chapter 2 - Measurements and Calculations ± Quantitative property – measurements in numbers ± comparison based on a known/accepted scale Example: Each finger nail of the Guinness world record holder is about 3 ft . ± Always has 2 parts – the number and the unit The reliability of measurement has to be known - sensitivity, - calibration of the instrument The temperature outside is 92 does not make sense unless a unit is specified. Scale Scientific Notation ( Exponential notation) - for assessing the magnitude - very large or very small numbers in a form of shorthand - expressed as a product number between 1 and 10 and a power of 10. the age of the earth : 4,600,000,000 years Æ 4.6 x 10 9 yrs or 4.6 EE 9 4.6 x 10 ^ 9 A number, n can be written in scientific notation as follows : n = C x 10 e exponent ( positive or negative integer) coefficient (always between 1 and 10) width of a plant cell is around : 0.000013 m 1.3 x 10 -5 m Writing numbers in scientific notation 1. Check to see if the number is greater than 10 or smaller than 1 . If
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Lecture2-C - Chapter 2 - Measurements and Calculations...

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