Units and Measurement

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Units and Measurement
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Units
5 m here the unit is meters (m)
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Why are units important?
5 inches is very different from 5 feet.
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Why do we need standard units?
Would someone know how long 5 knuckles was?
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The SI basic units -mks
Length - meter Mass kilogram Time - second
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The SI basic units - cgs
Length - centimeter Mass gram Time - second
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English basic units
Length foot Mass slug Time - second
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Metric Prefixes - large
mega M 106 kilo k 103
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Metric Prefixes - small
centi c 10-2 milli m 10-3 micro m
10-6 nano n 10-9