SI Measurements Numbers are tools, not rules. G. O. Ashley Slide
2 Why is the SI System Common? 1.The SI system uses a decimal
system as its base. 2.The SI system has seven standard or base
units and all other units are combinations of these seven. The U.S.
is one of the few countries that has not switched over completely.
However, when it comes to science we do use the metric system !
Slide 3 SI System Prefixes Slide 4 What are the SI Prefixes? DO NOT
COPY THIS CHART PrefixMultipleScientific NotationAbbreviation
mega-1,000,000 (Million)10 6 M kilo-1,000 (Thousand)10 3 k
hecto-100 (Hundred)10 2 h deka-10 (Ten)10 1 da deci-0.1 (Tenth)10
-1 d centi-.01 (Hundredth)10 -2 c milli-0.001 (Thousandth)10 -3 m
micro-0.000001 (Millionth)10 -6 nano-0.000000001 (Billionth)10 -9 n
Slide 5 What are the SI prefixes? Slide 6 I Do (Dont write, just
watch): 492 km = __________________________ cm Which one is larger?
8.20 g or 45.8 cg? Slide 7 We Do: 1.2 mg = _______________ g Circle
the one that is correct: 7.52 L = 0.752 mL or 3.4 cm = 34 mm You
Do: 5.12 m = ______________ dkm Circle the one that is correct:
59.0 mg = 0.0590 g or 0.82 kg = 0.00082 g Slide 8 What is the
difference between precision and accuracy? Precision how well
repeated measurements of a value agree with one another (Precision
is a measure of exactness) Accuracy is determined by the agreement
between the measured quantity and the correct value. (Accuracy is a
measure of rightness) Slide 9 Precise or Accurate? Slide 10 Which
group(s) made precise measurements? Which group(s) made accurate
measurements? (accepted value is 4.01 mL) Group123 Trial 15.92
mL4.01 mL25.02 mL Trial 24.01 mL4.02 mL25.01 mL Trial 33.52 mL4.00
mL25.03 mL Slide 11 Practice Measuring With Precision Length:
______________
