Post on 20-Jan-2016
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Using Numbers in ScienceAND
Metric System
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Scientific Measurements
• Made in metric units• Referred to as the International System or SI
units• Based on the decimal system• Related by powers of 10• Each type has a base unit• Use prefixes to refer to a unit larger or smaller
than the base by some power of 10
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SI (International System) unitsLength meter m
Mass kilogram kg
Temperature Kelvin K
Time second S
Volume Liter L
Centigrade or Celsius = ºC This is the unit we will use in lab for temperatures!
Prefixes for Metric Units <1
deci (d) = 1/10 = 0.1 centi (c) = 1/100 = 0.01 milli (m) = 1/1000 = 0.001decimilli (dm) 10-4 centimilli (cm) 10-5
micro (µ)10-6 = 1/100000 = 0.000001
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Prefixes for Metric Units >1
deka (da) = 10
hecto (h) = 100
kilo (k) = 1000
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Kilometer
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Meter
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Centimeter
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kilo hecto deca Base Unit
deci centi milli micro
k h da gram (g) d c mm μ
1000 100 10 liter (L) .1 .01 .001 0.000001
103 102 101 meter (m) 10-1 10-2 10-3 10-4 10-5 10-6
Metric Unit Conversions (blue chart)
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Comparison Ideas
equals
equals
Class ActivityWhat are the correct abbreviations?
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____ milligram ____ milliliter ____ liter _____centimeter
____ kilogram ____ millimeter ____ kilometer ____ gram
____ meter ____ millisecond ____ microgram
____ micrometer ____ microliter
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Review Questions
1. What does the prefix "milli" mean?
A. millionth B. thousandthC. hundredth
2. A liter is a little more than a _______
A. pound B. gallon C. quart
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3. What is a good height for a basketball player?
A. 6 meters B. 2 meters C. 6 millimeters
4. Which is the longer distance to run ?
A. 50 metersB. 50 kilometersC. 50 miles
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5. Which value would be right for the mass of a
A. 17 mg B. 17 g C. 17 kg
6. Which value would be right for the mass of a
A. 460 mg B. 460 g C. 460 kg