measurement units

In the study of physics it is important to know a little more about the units of measurement, which are measures of certain quantities.

The International System of Units (SI) is a set of information about the mediated units agreed throughout the world.
In the SI there are some fundamental units, from which other derived units arise.

See the table below, it represents the set of measurement units (considered fundamental units) of the most important quantities in the study of physics.

UNITY SYMBOL GREATNESS
subway m Length
kilogram kg Pasta
second s Time
ampere THE Electric current
kelvin K thermodynamic temperature
mole mole amount of matter
radian rad flat angle

 

From these units there are other derived units such as: area, volume, velocity, acceleration, see some:

Area unit: m . m = m 2
Force Unit: N or kg . m/s 2
Unit of volume: m . m. m = m 3
Pressure Unit: Pa or kg/(m . s 2 )
Speed ​​Unit: m/s
Energy Unit: J or kg . m 2 /s 2
Acceleration unit = m/s 2
Electric charge unit: C or A . s

Prefixes in SI

   PREFIX       SYMBOL    POWER OF 10 EQUIVALENT 
giga G 10 9
mega M 10 6
kilo k 10 3
hecto H 10 2
deca gives 10 1
decided d 10 -1
cent ç 10 -2
milli m 10 -3
micro μ 10 -6
nano no 10 -9
peak for 10 -12
femto 10 -15
act The 10 -18
zepto z 10 -21
yocto and 10 -24

 

We can make some representations with these prefixes, see:
0.000003 = 3 . 10-6 s = 3 μs
9 000 000 000 m = 9 . 109 m = 9 Gm

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