xkcd #3187: High Altitude Cooking Instructions
Title text:
1,300,000-1,400,000 ft: Ask a crew member to show you how to use the ISS food warmer.
Transcript:
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Source: https://xkcd.com/3187/
this post was submitted on 29 Dec 2025
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Definitely not as much as half a cup.
Wouldn't it depend on how many cups the original recipe calls for?
I wonder if it's assuming you don't use a slightly lower heat output though despite the lower boiling point?
If you're cooking something at altitude you shouldn't lower the heat - you still need to cook it properly.
Boiling water is a fixed temperature at a given air pressure. Turning up the heat doesn't make the water hotter. You just lose it faster. If you need higher temperatures and are cooking in boiling water, then you have to use a pressure cooker.
Who said anything about turning the heat UP?