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nuclear fission and fusion
whats the difference, i don't understand . . . .
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Fission involves splitting
Fusion involves joining together.
This page is useful.
http://www.bbc.co.uk/...learfissionrev2.shtml
Fusion involves joining together.
This page is useful.
http://www.bbc.co.uk/...learfissionrev2.shtml
and talking about elements, does density have a relationship with the state of an element at any given temperature? so would all the densist materials be solid then quite dense be liquid then really undense elements be gases? And does this link with relative atomic mass, or does it depend on the molecule size? Or is this going to be to confusing to explain?
Also help here mollikins. http://www.wisegeek.c...ission-and-fusion.htm
Fission is splitting up large elements like Uranium into smaller elements and releasing energy because the energy needed to hold together the smaller elements is less.
Fusion is sticking together light elements like Hydrogen to make heavier elements and getting energy out that way.
How can you get energy by splitting and sticking together?
Well there's a basically a curve - the most stable is Iron. splitting heavy elements until you get to iron gives you energy, fusing light elements until you get to Iron does likewise
Fusion is sticking together light elements like Hydrogen to make heavier elements and getting energy out that way.
How can you get energy by splitting and sticking together?
Well there's a basically a curve - the most stable is Iron. splitting heavy elements until you get to iron gives you energy, fusing light elements until you get to Iron does likewise
What makes an elenent a solid liquid or gas is mostly about its chemistry and how strong the bonds between elements.
The density of a particular element is complicated but generally goes up with the atomic mass.
There are some really complex relationships. Such as the reason Mercury is a metal and yet liquid at room temperature - it's to do with reletivistic effects of the electrons in this particular configuration
The density of a particular element is complicated but generally goes up with the atomic mass.
There are some really complex relationships. Such as the reason Mercury is a metal and yet liquid at room temperature - it's to do with reletivistic effects of the electrons in this particular configuration
Yes they are in effect exo- and endo thermic reactions but nuclear reactions not chemical ones.
They are the reason we have supernovae.
Stars are fusing hydrogen to create energy which balances the gravity.
They go through various cycles but in the end they run out of light materials and try to create iron - endothermic.
All of a sudden there is nothing balancing the gravity and they fall in on themselves in a titanic explosion - enough to create all the other elements.
The iron in your blood was created in an explosion just like that
They are the reason we have supernovae.
Stars are fusing hydrogen to create energy which balances the gravity.
They go through various cycles but in the end they run out of light materials and try to create iron - endothermic.
All of a sudden there is nothing balancing the gravity and they fall in on themselves in a titanic explosion - enough to create all the other elements.
The iron in your blood was created in an explosion just like that
Stars fuse hydrogen until it gets low in supply. Then they start fusing helium into various elements mostly up to up to oxygen and asome selected heavier elements. However the radiation pressure of these reactions is very much lower than the hydrogen reaction and cannot resist the gravitation.
Most of elements heavier than oxygen form when lighter elements are utterly crushed together as the gravitational implosion bottoms out and the shock wave bounces out into a supernova.
This page has a good description.
http://www.astrophysi...ics/stars/Fusion.html
Most of elements heavier than oxygen form when lighter elements are utterly crushed together as the gravitational implosion bottoms out and the shock wave bounces out into a supernova.
This page has a good description.
http://www.astrophysi...ics/stars/Fusion.html
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