Temperature is a measure of kinetic energy at the molecular/atomic level. That said, the gasses falling into a black hole would likely reach such hypothetical temperatures as they near the event horizon.
Not necessarily. In fact, it’s possible for gravity at the event horizon to be less than Earth’s gravity.
But what about cutting steel with a plasma torch? Could you see macroscopic results of particles doing counterintuitive quantum stuff?
Certainly! You can see discrete emission lines from the ionized air molecules, which only occurs because of quantum physics. I realize that’s not what you’re asking though.
I did a quick calculation and for a plasma torch (~27000 Kelvin) and assuming air molecules, the average velocity of the plasma ions would only be like 6000 m/s. That’s 0.001% the speed of light, so you aren’t going to see any relativistic effects.
So… no superposition, entanglement, tunneling or teleportation in macroscopic scale. ☹️
Sorry, physics can be cruel sometimes :(