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A comment on Humans could recolonize Earth after mass extinctions with ectogenesis. Parent comment

Re:Humans could recolonize Earth after mass extinctions with... by FooBarBizBazz on Saturday August 07, 2021 @11:48AM (#28099478)
You can turn work into heat with friction or turbulence. You don't need electrical thingamajigs. But even "small" amounts of heat involve huge amounts of energy. If I haven't just made a mistake, it takes 40 MJ to raise a bathtub full of water from room temperature to bathwater temperature.

Better to use trees and wood for heat: The original solar power system.

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Re:Humans could recolonize Earth after mass extinctions with... by FooBarBizBazz on Saturday August 07, 2021 @04:40PM (#28101635)
Redoing the math, I get more like 20 MJ to heat a bathtub.

For comparison, supposedly Teslas ship with 80 kWh = 288 MJ batteries. So you can take 14.6 baths with the energy in that battery.

That's more than I'd expected.

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