Eh, does the weight change if the sand runs from top to bottom? Some
quantum mechanic effect I am missing? Or maybe a change in gravity as
the sand drops from high to low?
phil wrote:
Even defining when the sand timer is "done" is not a real
simple thing. Waiting for that very last particle to drop may
not be the best approach.
Bob
You could measure of the weight of the hourglass.
Phil
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