Energy How
How does nuclear fusion produce energy when it requires energy?
How come atoms release energy when they are split, and also release energy when they are combined?
Also, if a star's mass is the force that combines hydrogen atoms and creates all the elements (via gravity), doesn't all energy in the universe initially come from the force of gravity? Where does this energy come from?
Mass and energy are the same thing, and the law of conservation of energy says "energy cannot be created or destroyed, only converted from one form to another".
As far as I can understand, some fusion reactions release energy, proton-proton repulsion, stored in atomic nuclei. Other fusion reactions store energy in the form of proton-proton repulsion. As well, neutron absorption following neutron-proton transmutation store energy in heavier atomic nuclei such as uranium. Hence, neutron is needed to destabilize heavier atomic nuclei releasing stored energy, as well energetic collisions to fuse light atomic nuclei creating unstable nuclei releasing energy, or creating stable nuclei storing energy.
Gravational energy is not consumed, I think it acts as a catalyst increasing pressure, which increases the temperature favoring energetic collisions.
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