Google is cool! I am going to have to experiment more with that
function of it.
--- In
Homebrew_PCBs@yahoogroups.com, "Stefan Trethan"
<stefan_trethan@...> wrote:
>
> On Fri, 01 Sep 2006 00:18:05 +0200, herby1620 <herby1620@...>
wrote:
>
> > Thickness in um =
> > 0.5 ∗ 10000 454
> > ---------------------- ∗ ---- = 17 um
> > 2.54 ∗ 2.54 ∗ 16 ∗ 144 8.94
> > Some of the numbers used (for reference):
> > 0.5 = ounces/sq-foot (amount of copper)
> > 10000 = um/cm (microns per cm)
> > 2.54 = cm/inch
> > 16 = ounces/pound
> > 144 = square inches/square foot
>
>
>
> I certainly know _why_ i love the SI! That's just frightening...
>
> I certainly also love google - enter the following line as a
search term:
>
> 8920kg/m^3∗1ft^2∗35micrometer in oz
>
> and you get
>
> 1.0230976 ounces
>
> The good thing about google calculator is it can deal with units
and do
> the conversions for you. And if you have a mistake in the formula,
like
> divide somewhere instead of multiplying, the result will just not
come out
> in the correct unit. If i do that on paper i need to engage brain
to check
> that....
> Sadly it does not (yet) know the density of copper automatically
it seems.
>
>
> ST
>