this post was submitted on 14 Jul 2025
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[–] someguy3@lemmy.world 8 points 1 day ago* (last edited 1 day ago) (18 children)

As I've learned more, the energy from a single atom is not much. They split nitrogen long before uranium but it didn't really matter. You need the chain reaction of uranium.

From Gemini:

The energy released from a single uranium atom splitting is an infinitesimally tiny fraction of what's needed to even warm a mug of water. You would need the simultaneous fission of approximately 1.96 quadrillion (1,960,000,000,000,000) uranium atoms to heat a single mug of water.

*JFC what's up with the downvotes? Because I used Gemini?

[–] NocturnalMorning@lemmy.world 44 points 1 day ago (4 children)

Thank God there was an AI here to tell us something we could just look up.

[–] egrets@lemmy.world 13 points 1 day ago* (last edited 1 day ago) (3 children)

I was interested in whether this was accurate. I got a similar answer, but I know almost nothing about nuclear fission and math is not my strong suit. Here it is anyway:

The heat capacity of water is fairly linear. At normal atmospheric pressure, it's 4,200J/kg°C, which means a 300ml mug of water would take 1,260 joules to raise by 1°C and thus 75,600 joules to raise by 60°C.

Fission of a single atomic nucleus of U-235 releases an average of 3.2e-11 joules (0.000000000032). To release 75,600 joules would presumably take fission of 2.3625e+15 atoms (2,362,500,000,000,000 -- two quadrillion three hundred sixty-two trillion five hundred billion).

[–] someguy3@lemmy.world 1 points 1 day ago

Considering it was 250 ml by 60 C, looks bang on.

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