Question

what are the necessary condition for nuclear fusion​

Answer 1

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High temperature - The high temperature gives the hydrogen atoms enough energy to overcome the electrical repulsion between the protons. Fusion requires temperatures about 100 million Kelvin (approximately six times hotter than the sun's core). At these temperatures, hydrogen is a plasma, not a gas.

Answer 2

Three main conditions are necessary for a controlled thermonuclear fusion: The temperature must be hot enough to allow the ions of deuterium and tritium to have enough kinetic energy to overcome the Coulomb barrier and fuse together