378
Oh no... (lemmy.world)
submitted 2 days ago by The_Picard_Maneuver@lemmy.world to c/whitepeopletwitter@sh.itjust.works
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[-] starman2112@sh.itjust.works 23 points 2 days ago* (last edited 16 hours ago)

Fun fact! It is thermodynamically impossible to make a vehicle that derives its energy from water. You cannot get more energy out of a water molecule than you put into it.

Edit: forgot about fusion. It is thermodynamically impossible to derive energy from the chemical bonds in water without putting more energy in than you get out. None of these water powered cars are using fusion generators. They're all about splitting the oxygen from the hydrogen and then burning the hydrogen with the oxygen, and there simply isn't a way to do that without wasting a ton of energy

[-] WoodScientist@lemmy.world 10 points 2 days ago

CHALLENGE ACCEPTED.

My car contains a small micro-singularity levitating in a magnetic field. The engine feeds small amounts of matter into it, capturing a sizable fraction of the rest-mass of the infalling matter as usable energy. The fuel I choose to feed the black hole powering my car? Ordinary water.

I have invented the water-powered car.

[-] tomi000@lemmy.world 24 points 2 days ago

You can heat the water somewhere, make the vehicle use the heat as energy, then swap out the cooled water for fresh hot water after driving 50m

[-] original_charles@lemmy.world 3 points 2 days ago

Damn, that's so crazy. Where do you live? Do you go through deserted alleys often?

[-] prime_number_314159@lemmy.world 10 points 2 days ago

You could fuse it into silicon and helium, and produce quite a bit of energy that way.

[-] zaubentrucker@sopuli.xyz 15 points 2 days ago

Only if I'm not allowed to do fusion

[-] starman2112@sh.itjust.works 13 points 2 days ago

That technology is only 10 years away, I hear

[-] Mammothmothman@lemmy.ca 6 points 2 days ago

That was 30 years ago.

[-] PapaStevesy@lemmy.world 4 points 2 days ago

Well wait a second now, how small can we get hydroelectric dams? Let gravity do the work, sounds easy.../s

[-] Rooster326@programming.dev 1 points 2 days ago

Well how much energy did you put into your water molecules?

[-] rustydrd@sh.itjust.works 1 points 2 days ago* (last edited 2 days ago)

Not even if we squeeze it, like, real gentle but for a long time?

this post was submitted on 25 May 2026
378 points (97.5% liked)

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