Re: Conundrum of Mass and Energy
- From: Ben Rudiak-Gould <br276deleteme@xxxxxxxxx>
- Date: Fri, 27 May 2005 11:01:19 +0100
BottleBob wrote:
============================================================
You have a 1 meter diameter spherical surface of Unobtanium 597. It has no mass.
This material is 100% reflective in the entire electromagnetic
spectrum, has zero thermal conductivity, infinite strength and
reflects all known particles as well.
Inside this sphere is a 10 kilogram fissionable mass, triggered to explode in a nuclear fireball at a huge efficiency
*at a random time*.
When it goes off half it's mass will, in the end,
become photons of various sorts and the particles that remain will all be neutrons (and thus not interact with
the photons). The photons just keep bouncing off
the inside of the sphere ......
How much does the sphere and it's contents mass? When? ============================================================
Ridicule in the other responses notwithstanding, this is a perfectly reasonable question, if not very clearly stated.
The point is: if a nuclear reaction takes place inside a sealed box, does the mass of the box change?
The answer is no. There's nothing about a nuclear reaction that changes mass into energy any more than any other kind of reaction does. An ordinary AA battery converts mass into energy in exactly the same sense that a nuclear explosion does. It just converts a lot less of it.
-- Ben .
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