These 2 pages from National Institute of Standards and Technology (NIST 
- used to be called the National Bureau of Standards before I retired) 
will explain how scientists are using the International System of Units 
(SI).  These definitions are the ones t:hat are required  in order to 
meet the rules and style conventions for papers that are to be published 
in major scientific journals.  What is printed elsewhere, of course, may 
or may not conform to the SI standards....Usually the intent is clear, 
however, so it works.

And speaking of capitalization, if many emails that I see are the sign 
of the future, a good deal of what used to be "correct" spelling  and 
and punctuation may be on the way out....e.g., skipping the capital 
letters entirely.  Maybe e.e. cummings started it all.

The first page, below, shows the SI base quantities with their names and 
symbols, where some symbols are in small letters and others are in caps.:

<http://physics.nist.gov/cuu/Units/units.html>



This next page shows the SI prefixes for various factors  - i.e., using 
+/- powers of 10.  Factors using negative powers of 10 all use small 
letter symbols, while *most* of the positive powers of 10 use capital 
letter symbols...****except for kilo, hecto and deka ****  :

<http://physics.nist.gov/cuu/Units/prefixes.html>








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