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Unites of measure are the means by which physical quantities are given numerical values relative to some standard. The International System of Units (SI) is the system of units of measure adopted as global standards by international treaty.

Seven SI Base Units

meter distance
kilogram mass
second time
ampere current
kelvin temperature
mole amount of substance
candela intensity of light

Common Derived SI Units

newton force   coulomb charge
Joule energy volt potential
tesla flux density farad capacitance
hertz  frequency ohm resistance


SI Prefixes

Prefix

Symbol

10n

Scale

decimal

giga- G 109 billion 1,000,000,000
mega- M 106 million 1,000,000
Kilo- k 103 thousand 1,000
Hecto- h 102 hundred 100
deca- da 101 ten 10
- - 100 one 1
deci- d 10-1 tenth 0.1
centi- c 10-2 hundredth 0.01
milli- m 10-3 thousandth 0.001
micro- m 10-6 millionth 0.000,001
nano- n 10-9 billionth 0.000,000,001

Click here for an extended list of SI unit prefixes.


References

International System of Units from NIST

Current definitions of the SI units

AfterMath: Scientific Units


 

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