@nosat Thanks for conceding the point about light.
Air pressure goes down as you move away from the surface, but it is never zero. So no need to worry about a zero/non-zero boundary because there isn't one, just a smooth pressure gradient.
@nosat Thanks for conceding the point about light.
Air pressure goes down as you move away from the surface, but it is never zero. So no need to worry about a zero/non-zero boundary because there isn't one, just a smooth pressure gradient.