Tim S wrote:
dennis@home coughed up some electrons that declared:


"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.

Phone call for you - some bloke called Albert...

Seriously - yes, there is a mass increase.

You'd be hard pushed to measure it though.

eg, a 60Ah 12V car battery might be claimed to store 60*3600*12 joules of
useful energy. That's about 2.6MJ

That is equivalent to a mass of 2.88E-11 kg, or 28.8 nanogrammes


Thanks for that. I couldn't remember what it was, but that feels about
right.


I do know that a nuke power station the gigawatt level uses 50 tons of
(enriched) uranium a year, and you get almost 50 tons of reprocessable
uranium out the arse end of it!


Cheers

Tim