this post was submitted on 09 Apr 2025
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No Stupid Questions
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There’s a lot of things under the streets of New York, many of them cause heat. In order to cool them off the heat is vented outside and the warm moist air meets with the cool dry air and condensates into droplets that we see as steam. Same affect as breathing out on a cold day, you’re not creating steam but it looks that way because the warm moist air from your breath is condensing in the cool dry air.
Could you name one thing that would cause heat under streets? It's kinda hard to believe tbh
Pipes transferring steam.
https://en.m.wikipedia.org/wiki/New_York_City_steam_system#%3A%7E%3Atext=Con+Edison%27s+Steam+Operations+is%2Cbuildings+and+businesses+in+Manhattan.
When you take a hot shower where do you think that water is going?
Wouldn't it cool off in the sewer, though?
Yes but hot water continues to flow in.
And it doesn’t need to stay very hot. It just needs to be warmer than the outside air temperature in order for vapor to form.
The ground and continuous hot water input keeps everything insulated.
But cold water is also continuously flowing in. And as someone said, it perhaps cools down quickly. Is that all and all enough for such a dense vapor cloud to appear as in pic?
If it is colder above ground, than the ambient temperature of the ground, IIRC that's somewhere in the 50° F range, and less humid than the sewers, sure.
Yeah okay maybe. In the winter for sure
More hot water than cold water is flowing in. It’s a simple thermodynamics problem
How so, or do you just wanna sound smart
I just told you. How slow are you?
Oh I thought you meant to add something with the word thermodynamics, but apparently you just wanted to say something fancy that didn't actually add to what you already said.
Subway brakes.
Ehhhhhhhh
Ask London.
https://hackaday.com/2024/12/04/the-london-underground-is-too-hot-but-its-not-an-easy-fix/