this post was submitted on 07 Oct 2023
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Science Memes

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Thermal Energy Intuition (lemmy.ml)
submitted 1 year ago by [email protected] to c/[email protected]
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[–] [email protected] 10 points 1 year ago* (last edited 1 year ago) (2 children)

My math: Boiling a cup (0.24 kg) of water from 25°C to 70°C ~45kJ (0.24kg×45°C×4182J/kg°C) Raising 0.24 kg of water up a height 30,000 m ~ 71kJ (0.24kg × 9.8m/s^2 × 30,000 m)

So my math says raising the temp of a cup of water from room temp would be equivalent to raising it about 19 km high.

Edit: I'm a moron who can't read, boiling water from 25 to 100 °C takes:

0.24 kg × 75 °C × 4182 J/kg°C ~ 75kJ

[–] [email protected] 13 points 1 year ago* (last edited 1 year ago) (2 children)

Water boils at 100°C

[–] [email protected] 7 points 1 year ago (1 children)

God I'm stupid. I misread what you wrote as raising water to 70°, not raising water by 70°, without even thinking that that's not how you make tea. Fixed my math, and the numbers now check out.

[–] [email protected] 1 points 1 year ago

Actshually, that is how you make green tea

[–] [email protected] 5 points 1 year ago

They could drink green tea, which seeps at around 70.

Or that could be jasmine, its one of them.

[–] [email protected] 1 points 1 year ago

In the ISA atmosphere model, the tropopause starts at an altitude of 11 km. So you might be able to say that 19 km counts as 'stratosphere'.