Re: [ATM] Suspect glass question

[Ben McIlwain <cydeweys@gmail.com>]

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Anthony Stillman wrote:
>> ...a 16.375" x 2.125 glass blank
>
> It has a mass of  AREA * THICKNESS * MASS per UNIT VOLUME.  The
> density (mass per unit volume) of pyrex is 2.23 grams per cubic
> centimeter.  So if its pyrex, it has a mass of 16.354 kg  (36.054
> lbs).  Plate (soda lime) has a density of 2.4 g/cm^3.  It's 7.6
> percent denser than pyrex.  If its plate, it will weigh 38.802 lbs.

Doing density calculations is a good idea.  But I might suggest a
different method if the dimensional measurements given aren't completely
accurate.  Remember Archimedes?  Measure how much volume the blank
displaces (using water would be easiest), then divide that into mass to
get the density.
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