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Forum » E=mc^2
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Thread: E=mc^2

post 1690019033 09-13-2023, 06:14 PM
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E=mc^2

The bomb dropped on Hiroshima weighed about 4.4 tons in total (including all the conventional explosives required to "trigger" the uranium into supercriticality).

There was only around 64kg of actual uranium 235 in there. Of that, only around 1kg of uranium reacted and underwent fission, the rest was immediately blown apart by the fission and explosion of the initial 1kg, and instantly became subcritical and did not react.

So only a kilogram of Uranium underwent fission to produce the bomb that destroyed a whole city.

Fission of Uranium 235 results in around 0.09% of the original mass being converted to energy (the loss in mass between the original nucleus and the resulting fission products).

This means less than a single gram of matter being converted into energy caused a 15 kiloton explosion that leveled a city and killed 80k people.

The more you know.
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post 1690019123 09-13-2023, 06:17 PM
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post 1690019153 09-13-2023, 06:17 PM
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That is based on our limited engineering and financial resources.

Theoretically, a much smaller amount of matter is capable of producing much much more energy.
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post 1690019293 09-13-2023, 06:19 PM
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post 1690019363 09-13-2023, 06:20 PM
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Originally Posted By Ironmanlet⏩
That is based on our limited engineering and financial resources.

Theoretically, a much smaller amount of matter is capable of producing much much more energy.
Nope this is after taking that into account. Once you whittle everything down, a single gram of matter (roughly) was converted into energy during that explosion. Of course that required a kilogram of Uranium undergoing fission, and a supercritical mass of Uranium (64kg) being first assembled at detonation, with then a 4+ ton overall bomb to achieve supercriticality via conventional explosives, tampers, etc.

But basic E=MC^2 gets you the above boom.
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post 1690019423 09-13-2023, 06:22 PM
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post 1690019473 09-13-2023, 06:24 PM
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Originally Posted By isingmodel⏩
Nope this is after taking that into account. Once you whittle everything down, a single gram of matter (roughly) was converted into energy during that explosion. Of course that required a kilogram of Uranium undergoing fission, and a supercritical mass of Uranium (64kg) being first assembled at detonation, with then a 4+ ton overall bomb to achieve supercriticality via conventional explosives, tampers, etc.

But basic E=MC^2 gets you the above boom.
Whereas the most efficient chemical reactions produce about 1 × 10^7 J/kg, nuclear fission 8 × 10^13 J/kg, and nuclear fusion 3 × 10^14 J/kg, the complete annihilation of matter and antimatter, according to Einstein's mass-energy relationship (E = mc 2), yields 9 × 10^16 J/kg.
Our abilities are the limiting factor.

Lol at how confident you were with your little nope.

Not even close man.
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post 1690019653 09-13-2023, 06:28 PM
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Originally Posted By Ironmanlet⏩
Nuclear fusion releases up to four times the amount of energy for the same weight of fuel compared to fission.

Our abilities are the limiting factor.
Yes that is true about fusion. But that is only a question of efficiency of the fuel itself.

That is to say in order to get 1g of matter to be converted into energy, you may not need as large of an apparatus to make the boom happen in the first place.

But the amount of megajoules you get when converting X amount of matter into energy is the same, regardless of the fuel, or technology used.

E=MC^2 does not change for different fuels, bro.
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post 1690020533 09-13-2023, 06:59 PM
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