chapter1 - 1.3 Units of Measurement measurements: consist...

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1.3 Units of Measurement · measurements: consist of a number and a scale · SI system: internationally accepted system of measurement 1 dm 3 = (10cm) 3 = 1 L 1 cm 3 = 1 mL mass: measure of an objects resistance to a change in its state of motion F = m * a F= weight (force) m= mass a= acceleration due to gravity micro nano (u) (n) .000001 .0000001 mega kilo hecto (M) (K) (h) (da) 100,000 1,000 100 10 10 6 10 3 10 2 deka base deci centi milli unit (d) (c) (m) 1 .1 .01 .001 10' 10 0 10 -1 10 -2 10 -3 10 -6 10 -9 1.4 Uncertainty in Measurement measurement always has some degree of uncertainty (depends on the precision of the measuring device) · significant figures: certain digits and the first uncertain digit in a measurement (uncertainty in last digit is assumed to be + 1) Example: 25 mL 25 +- 1 mL measurement between 24 & 26 mL 25.00 25.00 +- 0.01 mL measurement between 24.99 and 25.01 mL
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2. Leading zeros aren't significant 3. Captive. .. significant 4. Trailing zeros (w/o decimal point) not significant
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chapter1 - 1.3 Units of Measurement measurements: consist...

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