dennis@home wrote:


"Max Demian" wrote in message
...
"Owain" wrote in message
...
On 16 Sep, 23:42, "Max Demian" wrote:
Energy is neither created nor destroyed
Only according to classical physics.
Except in nuclear power stations and in stars.
And springs and batteries and everything else that stores energy.
(Not that
you can measure the differences in mass.)

Surely if you're storing energy you're not creating or destroying it?

Maybe, but it violates the conservation of mass.

You can store energy without converting it to mass.
Chemical (batteries), and mechanical (springs) methods store energy
without converting it to mass.


Oh, but they DO.

Its a very very very small change though. We calculated the difference
in weight between a discharged and charged lithium batery. Much less
than a microgram IIRC.