# Re: Nuclear power

On Mon, Nov 25, 2013 at 3:56 PM, LizR <lizj...@gmail.com> wrote:

> I heard that hydrogen nuclei in the sun fuse after on average 5 billion
> years of wandering around bumping into each other (I guess that's kind of
> obvious - the Sun is due to "live" for about 10 billion years, so it must
> use its fuel at a comparable rate). So the energy production per volume
> would seem fairly low - one in 5 billion nuclei fuse per year, or one in
> 150 x 10^15 per second. I guess density is around 10^23 per cubic meter
> give or take an order of magnitude, so about a million atoms fuse per cubic
> metre/second. If I read Wikipedia right, each one releases about 7 Mev so a
> million release about 7 x 10^12 ev or around 10^-6 J/sec, which I believe
> is one microwatt.
>
> Damn, I've slipped up somewhere, haven't I? Maybe someone with more of a
> head for maths can do the calculation properly.
>
>
>
The density of the core is about 100 - 200 grams per cubic centimeter,
which is far more than the gas at STP (it takes 22.4 liters to equal one
mole of gas), so there would be ~50 times that volume in a cubic meter, and
then the gas is probably thousands of times standard pressure, but I don't
know the exact pressure necessary to get Hydrogen-helium plasma to that
density, but I imagine this might account for the discrepancy in your
calculation.

Jason

>
> On 25 November 2013 19:09, Jason Resch <jasonre...@gmail.com> wrote:
>
>>
>>
>>
>> On Mon, Nov 25, 2013 at 12:57 AM, Chris de Morsella <
>> cdemorse...@yahoo.com> wrote:
>>
>>>
>>>
>>>
>>>
>>> everything-list@googlegroups.com] *On Behalf Of *Jason Resch
>>> *Sent:* Sunday, November 24, 2013 9:33 PM
>>> *To:* Everything List
>>> *Subject:* Re: Nuclear power
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> On Sun, Nov 24, 2013 at 8:23 PM, Richard Ruquist <yann...@gmail.com>
>>> wrote:
>>>
>>> Stars are essentially fusion bombs and stars can explode.
>>>
>>>
>>>
>>> I like the analogy that stars are essentially just giant compost heaps.
>>>  The levels of energy production in the core of the sun is quite low on a
>>> per-volume basis: a few hundred watts per cubic meter.  On the same order
>>> as your own biological metabolism (and not much greater than that of a
>>> compost heap).  It is only by virtue of the huge volume of a star that it
>>> produces large quantities of energy, but all the energy of a cubic meter of
>>> stellar core would be just enough to run a TV or a computer.
>>>
>>>
>>>
>>> Very interesting; never considered it that way. Thanks for sharing.
>>>
>>
>> Thanks, though I can't take credit for it, I found it on
>> http://en.wikipedia.org/wiki/Solar_core#Energy_production which appears
>> to be largely inspired from:
>> http://www.abc.net.au/science/articles/2012/04/17/3478276.htm
>>
>>
>>>  So if a star is a compost heap, does that make a black hole the
>>> swirling flush of a cosmic toilet?
>>>
>>> I know… pretty much, a non-sequitur, but such is life :)
>>>
>>
>> :-)
>>
>> Jason
>>
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