Hopefully let’s hypothesize becomes an actual genre of posts
Brief description: so I have a fridge compressor hooked up to a radiator and hold my finger over the outlet till I the pressure literally pushes my skin out of the way; then I move my finger to release the pressure fully. When my finger moves I can see a mist come out
It’s not super consistent but I can get the mist to appear if I resist the pressure as much as possible can.
It’s also compressed air.
I do have a longer version of the video but the event happens so fast that it would be frustrating to sit through 30 seconds for .5 second event


My guess is it’s some oil vapor from the oil that’s used in refrigeration systems.