this post was submitted on 07 Oct 2023
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127
Thermal Energy Intuition (lemmy.ml)
submitted 11 months ago by [email protected] to c/[email protected]
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[–] [email protected] 10 points 11 months ago* (last edited 11 months 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 11 months ago* (last edited 11 months ago) (2 children)

Water boils at 100°C

[–] [email protected] 7 points 11 months 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 11 months ago

Actshually, that is how you make green tea

[–] [email protected] 5 points 11 months ago

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

Or that could be jasmine, its one of them.

[–] [email protected] 1 points 11 months 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'.