In case of nuclear fusion High density and high temperature is needed for the reaction to take place, whereas in nuclear fission there is a necessity to have a critical mass of substance and neutrons moving with high speed. And in nuclear fission uranium is one of the widely used fuels. In nuclear fusion hydrogen isotopes are used as fuel. Note: In fusion two or more atoms make one large atom and in fission one atom gets disintegrated into two or more smaller atoms students usually get confused between fusion and fission. In very few nuclear fusion reactions radioactive chemicals come out of. The nuclear fission reaction produces substances that are highly radioactive. This type of reaction takes place in the sun and stars. ![]() This type of reaction never occur in normal cases The consequence of fission or fusion is the absorption or release of energy. Fission is the splitting of a heavy nucleus into lighter nuclei and fusion is the combining of nuclei to form a bigger and heavier nucleus. It requires a huge amount of energy to combine two or more atoms into one single atom. The energy harnessed in nuclei is released in nuclear reactions. It requires less energy to divide one atom into two or more parts Power plant related experiments use this technology. Fusion reaction process occurs in the stars, like in the sun, etc. ![]() Fission reaction doesn’t occur normally in nature. Fusion is the process of combination of two or more lighter atoms or molecules into larger ones. Nuclear power plant uses this technology to produce energy A fission reaction is splitting up of a large atom or a molecule into two or more smaller ones. The release of energy during nuclear fusion reaction is way higher than that of the fission reaction. The amount of energy released in a nuclear fission reaction is much lower than the energy released during fusion.
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