Hector Martin wrote:

> As for conversion factors, I try to use SI throughout most things to
> avoid them 

Unluckily it seems that Google Calculator doesn't understand a number of
proper SI units, at least not the standard abbreviation.

> if you do the full copper thickness calculation by hand, you'll see most
> of the work is due to the use of funky imperial units.

Yes, that's why I have somewhere stored in non-volatile memory that 1 oz of
copper is roughly equivalent to 35 um thickness :)

Gerhard

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