Let's face it, humans like things easy.  It's much
easier to say "5 mills", than 5 thousanths of an
inch", although saying "250 thousanths" seems to be
more of the norm when machining in english units. 
Thickness, such as a plastic bag seems to be expressed
in Mills.  Confusion, of course.

When connecting thermocouples, RED is negative.  Go
figure.

Even the metric system has it's pecularities, the
Angstrom and the micron.

My boss once said, he likes numbers to be between 1
and 10.  In other words the exponent expressed in
words such as nano, micro, pico.

I prefer metric too, but when the parts and the tools
are English, do as the Romans do and use the unit of
measure that the parts are in.






      
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