Units of Measurement
SI Base Units
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Physical Quantity Name of Unit SI Symbol
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Length Meter m
Mass Kilogram kg
Time Second (s) Second (s)
Temperature Celsius ((C) Kelvin (K)
Amount of substance Mole mol
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Metric Prefixes
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Prefix Symbol Meaning Number Scientific Notation
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Prefixes that increase the size of the unit
mega- M one million 1 000 000 106
kilo- k one thousand 1 000 103
Prefixes that decrease the size of the unit
deci- d one tenth 0.1 10-1
centi- c one hundredth 0.01 10-2
milli m one thousandth 0.001 10-3
micro- ( one millionth 0.000 001 10-6
nano- n one billionth 0.000 000 001 10-9
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Converting Within the Metric System: Examples of Conversion Factors
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Prefix Base Unit Symbol Unit Equivalence Conversion Factors
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Mega- meter Mm 1 Mm = 106 m [pic] or [pic]
Kilo- meter km 1 km = 103 m [pic] or [pic]
1 meter
Deci- meter dm 1 dm = 0.1 or 10-1 m [pic] or [pic]
Centi- meter cm 1cm = 0.01 or 10-2 m [pic] or [pic]
Milli- meter mm 1mm = 0.001 or 10-3 m [pic] or [pic]
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