And if splitting atom releases energy, why haven’t these energy break from their atom themselves? Isn’t that means the force that bind the atoms are bigger than the energy released?
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I’ll try an actual ELI5 explanation
Imagine you have alot of matches that can spontanously ignite. Now imagine a nailboard of those matches with the ignition side pointing up. In nature, you do have these matches but they are far apart from each other. One can randomly ignite but it’s too far from the others to ignite them aswell. If one ignites, you can see the light and maybe if you put your hand next to it feel the warmth but thats about it. The macthes just aren’t close or concentrated enough. You can messure this small activity and Energy release in natural Uranium Ore
Now imagine if you put all the matches on that nailboard really close together. Now one randomly ignites, which ignites the one next to it, then the one next to it and so on. After a very short amount of time the whole board ignites in a big flame, with lots of light and heat. That’s what a nuclear bomb is. So much reactive Uranium stuffed together that it reaches a “ciritcal mass” and explodes.
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