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The International System
of Units is called "SI"
and is the Metric Measurement
used in America.
Base Unit or Derived Unit
or Unit of Measure
International Bureau of Weights and Measures SI Brochure notes:
"Unit symbols are mathematical entities and not
Among other things, they are not followed by a period except
the end of a sentence and they are not made plural.
for EVERYDAY USE
is 1 one hundredth
is 1 one thousandth (0.001)
is 1000 times
and base or derived unit
everyday unit of measure
place the prefix in front of the base
or derived unit
cm (centimeter), km
(kilometer) or mg (milligram),
kg (kilogram) and mL
The size or quantity is indicated by the first letter
and the second letter or symbol
base or derived unit.
We easily identify the
prefix centi when we think of 100 cents in the Unit
dollar. We could even refer to it as a "centidollar"
and you come pretty close to doing that anyway by calling it 1
cent. There are exactly 100 cents in a dollar just like
100 cm (centimeters) in a meter.
Got it? It just gets easier.
are used convention has it that they are
always lower case letters except where the
Base Unit is named after a person like Celsius (ฐC), Pascal (P) or
Newton (N) and 16 other scientists.
Then the symbol is noted by a CAPITAL LETTER.
So what's with a capital letter "L" for
Is that a capital "L" for the unit of measure
named after a person? No....
You see, when decimal
dimensions were described long before
the typewriter you would have to
write the script.
as technology came along it became apparent that typewriters were not
equipped with the script
so attempts were made
to use the lower case "l" (el).
Then it became further confusing to write "1l" (lower case
"el") as the "1" and "l" (el)
looked too similar as did the capital "I" (eye).
was chosen as the symbol
the derived base unit "liter".
in front of the base
or derived unit or unit of measure
OR everyday unit of measure
to make the Quantity, Size or Value smaller by
1 one hundredth (0.01)
even smaller by
1 one thousandth (0.001) OR
bigger by 1000 times as much