The Natural Philosopher wrote:
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.

Did you go to school?

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.

You calculated it _assuming_ that energy was converted into mass, which in
fact it isn't. Had you _measured_ it and found that the mass increased on
charging and decreased on discharging, then you'd be on to something,
probably a Nobel prize.