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What is fusion as opposed to fission and why does it need high temperatures and fast speeds?
Wiki User
∙ 9y ago
Fusion is putting together (atoms ... usually hydrogen atoms),
Fission is the breaking apart of atoms.
And fusion requires high energy to occur because it requires the nucleus of atoms to touch (collide) - not an easy thing to do (basically impossible using only chemical energy).
Wiki User
∙ 9y ago
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The conditions at the sun's core give very high pressure due to the gravitational forces, and also a high enough temperature. The earth isn't big enough to produce these conditions, and in any case is mostly made of heavy materials which would not undergo fusion. Efforts to make fusion on earth are using the two materials deuterium and tritium which have the lowest threshold conditions for fusion to start, but even so it is necessary to achieve higher temperatures than even on the sun to make a feasible power plant. In fact fusion on the sun has a surprisingly low power density, and a plant operating at those conditions would have to be huge to produce any useful power. Nothing achieved yet on earth has produced more power output than the input, but development continues and hopefully a solution will eventually be found. If not, mankind will run out of power (but not in our lifetimes).
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Why would gases diffuse faster on a warm day than on a cold day?
The molecules of a gas move faster at higher temperatures, which therefore speeds up diffusion.
