SI Base Units Explained  Ch 2 Std 6
Below are common units of measure by category:


English
( 
Metric 
SI
base units 
1 
Time 
second 
second 
second 
2 
Length 
in , ft. , yard, mi. 
m, dm, cm, mm 
meter (m) 
3 
Mass 
oz., lb., ton 
g, kg, mg, μg 
kilogram (kg) 
4 
Temp. 
°F 
°C, K 
K 
5 
Amount 
doz., gross, pair 
mole 
mole 
6 
Electric curremt 
ampere (A) 
ampere (A) 
ampere (A) 
7 
Luminous intensity 
candela (cd) 
candela (cd) 
candela (cd) 
SI Base Units
(International System
of Units)
The
7 SI Base Units in the last column of the chart above,
are used in most scientific measurements.
From these basic 7 almost all other units of measure can be
derived. We will only use rows 15. Rows 6 & 7 are used commonly in physics.
Derived Units of Measure
Derived
units of measure can be base units that are squared, cubed, etc. A few examples could be: m^{2} (gives area), m^{3}
(gives volume), cm^{2} , cm^{3} (used
as definition of mL) Derived units also come from dividing or multiplying
different base units together. We will
be using most of these examples during this course:
Examples:
density = _{} which can have any of these derived units of measure and more:
_{} or _{} or _{}
specific heat uses a derived unit of measure _{}
molar heat of fusion uses a derived unit of measure _{}
Other examples of derived units of measure are:
_{} _{} _{} _{} _{} _{}
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There
is a great website that has very complete background on SI Units, and my video
explaining this tutorial at: