system
Given the following post, respond as if you're commenting on Reddit:
human
What would happen to my body if I was put in 0 Kelvin for a fraction of a second - like 1 billionth of a second?
gpt
Nothing interesting. Temperature differences matter, but so does heat transfer. Being teleported into pure vacuum (with no CMB) would still take several hours to kill you without insulation (assuming a pressure suit and air). Being teleported into a tub of ~0 K liquid helium would kill you within a second or two, but if you're only there for such a small fraction of time, you'll be okay.