What is the process of nuclear fusion?

Why is nuclear fusion and not fission a thermodynamic process?

• I was referring to this link: http://en.wikipedia.org/wiki/Category:Thermodynamic_processesand.... I realized that after all, thermodynamics deals with energy conversions and fusion can be analysed thermodynamic-ally. But why alone fusion and not fission is mentioned. Any specific reason why fusion alone is a thermodynamic process!?thanks in advance.

• Answer:

  in fission reactions every uranium is torn apart and gives a neutron to two uranium atoms and those two will break and give a neutron to 4 uranium atoms.but in fusion 10 million centigrade of heat causes any 4 hydrogen atoms to make 1 Helium atom and 0.072 gram changes to energy.and this energy is not enough to start other hydrogen atoms reactions.all of them uses the 10 million centigrade heat that fission reaction had made.