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SI Base and Derived Units Charts and Tables
Last Revision: July 13, 2025
This post is intended to be an addendum to my post on SI Base Unit definitions.
Here I present tabulations of the various SI Base Units and the other units (quantities) derived from these units.
I also provide a basic Scientific Notation primer and a tabulation of common SI prefixes.
Exponentiation and Scientific Notation
Exponentiation
- xy = x raised to the y power; e.g. r2 = r squared= rr = r*r
- x-y = one over x raised to the y power = 1/xy
- e.g. r-2 = 1/r2
- e.g. a-3b2 = (1/a3)b2
“Times 10 to the power of” Notation
Scientific notation
- Known as the standard form,
- “x 10y” means times 10 to the power y
- e.g. 245,000 = 2.45 x 105
- e.g. 23,400,000 = 23.4 x 106
- e.g. .00234 = 23.4 x 10-4
E (or e) notation
- is short hand for “times 10 to the power of”.
- e.g. 245,000 = 2.45e5 = 2.45E5 = 2.45 x 105
- e.g. 1e6 = 1E6 = 1,000,000 = 1 x 106
- e.g. 1e-3 = 1E-3 = .001 =1 x 10-3
Engineering notation
- is a type of scientific notation where the exponent is always a multiple of 3.
- e.g. 245,000 = 245E3 = 245 x 103
See wikipedia.org for more on scientific notation.
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