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Metric System

 

Metric & Standard Measurement Systems

International System of Units (SI)

Base Units

Base quantity

Name

Symbol

length

meter

m

mass

kilogram      

kg

time

second

s

electric current

ampere

A

thermodynamic temperature      

kelvin

K

amount of substance

mole

mol

luminous intensity

candela

cd

Where did the kilogram SI unit come from?

 

Derived Units

Derived quantity Name Symbol
area square meter m2
volume cubic meter m3
speed, velocity meter per second m/s
acceleration meter per second squared   m/s2
wave number reciprocal meter m-1
mass density kilogram per cubic meter kg/m3
specific volume cubic meter per kilogram m3/kg
current density ampere per square meter A/m2
magnetic field strength   ampere per meter A/m
amount-of-substance concentration mole per cubic meter mol/m3
luminance candela per square meter cd/m2
mass fraction kilogram per kilogram, which may be represented by the number 1 kg/kg = 1

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