The adiabatic lapse rate is the reason. Its 2°C per 1,000ft or 3.5°F. If the plane is cruising at 30,000ft that’s a temperature difference of 105°F from the plane to the ground.
Did some flying for awhile, gets cold up there.
Edit: Actually yeah, if the comment above that the plane was 37k-41k is correct. Let’s says 40k for easy math, thats a 140°F temp difference. If the temp at altitude is -52°F then it would be 88°F on the ground. Math checks out!
TLDR shit is cold up there
Because altitude. Much like how Mt Kilimanjaro has snow on it despite being close to the equator.
Obviously I figured it’d be much colder, but I’ve been in -55°f wind chills and it took me being at 8000+ feet elevation, in a northern latitude, in the peak of a record setting winter, for us to hit that. So, yeah I expected freezing temps up there, but -52.6°f is making my brain hurt. It’s just so crazy that I figured it had to include some other weather phenomenon, not just altitude.
8000 feet standing on a mountain isn’t the same as being 8000 feet above the ground. It’s likely that what you’ve experienced is some combination of air from lower altitudes being carried by wind blowing up the mountain, and the ground absorbing sunlight and warming up the air.
Without either of those things, the temperature in open sky is likely to be colder than a mountaintop at similar altitude
Also, aircraft go far higher than 8000 feet. Crusing altitudes can be more like 20,000 or 30,000
Oh, I’m not disagreeing, and I assume that speed was not helping, I just had no idea that it got that cold. I was hoping, if you can call it that, that the incident was due to some freak weather phenomenon
This is why flying is an over-rated super power. It’d be cold and wet and windy and require heavy gear. None of this undies on the outside spandex stuff.
Chronicle is the only “super powers” movie to ever address this. Iron Man did too, but only when it helped the plot.
It’s super impractical. Also, how fast are you going to be able to fly? Because at 100km it’s so windy that after an hour you’d be sore from the resistance. It’s more comfortable to drive lol. Probably faster too. It really only has a local use case. Trans Atlantic for example would take days and suck beyond comprehension. Also, it’s boring as hell up there.
They were warned about problematic weather :(
The speed is actually helping keeping their air plane warmer due to aerodynamic heating.
Every 1000ft you go up, the temperature drops by about 2c
What do you figure the wind chill of a few hundred mph may be?
Irrelevant to those of metal blood.
I was once on a fancy airliner that had readouts on the seat backs. One thing you could see was temperature. I believe it was -175F or so. This was also over Florida BTW. Only reason I know about this!
That’s an erroneous readout. Modern aircraft have various limits on air temperature, but none in the negative triple digits.
You’re right! Looks like it’s more like -70F at 36,000 feet.
Its because the atmosphere is heated by the ground, not the sun.
Air is transparent. Sunlight will go right through it without transferring much heat at all. Instead the sunlight keeps going until it hits the earth.
The ground or water absorbs the heat from the sun, which heats the air just above it, which then rises and mixes with the colder air around it.
The heated air can only rise so far, so most of that heat stays near the ground, hence the temperature gradient between the surface and airplane cruising altitudes.
Space is very cold. It’s -270something C. The temperature on Earth is much higher. The rays that make it through to our atmosphere bounce off the ground, warming it up from the bottom up. That’s why you need a jacket when you climb up a mountain because it’s getting colder the higher you go. Imagine a mountain higher than anything we have. Eventually, you’ll get to -50 C.
Because that’s about how cold the air is at cruising altitude.
While on the same machine, the turbine blades that melt at 1250 degrees operate at 1500 degrees.
It’s all magic
As a professional aircraft mechanic, I can confirm. It’s all magic
wat?
Turbine blades are pure aluminum, which melts at 1220 degrees. They operate inside the compression chamber of the turbine to move gases that are around 1500 degrees. There’s a whole art to making them single crystals and optimizing flow rates so they don’t melt, or explode, or melt and explode. And a lot of work goes into making sure when they do melt and explode, they don’t turn into supersonic bullets. Just barely though, because armor is heavy.
thanks for the explanation. So because of the single crystal(??) they don’t melt since it changes the melting point?
The crystallization is mainly about strength so they don’t snap or deform at a billion rpm, because typical aluminum would shatter under the load. They don’t melt because of magic. https://www.youtube.com/watch?v=QtxVdC7pBQM
If you’re talking about the Learjet that crashed (RIP), I think it was cruising around 37-41k feet. I don’t know the scientific reason for why it’s so cold up there.
The ground is opaque and dense so sunlight heats it effectively and it holds onto that heat well. Air is transparent and not very dense so it doesn’t heat well nor does it hold that heat.
Warm places are warm near the ground, but as you gain altitude it becomes cold quickly no matter where you are.
