Very light dust, which behaves opposite gravity.
|Acid dissolve rate
Anti-air is a very light powder which falls in the direction opposite to gravity. For example, in normal gravity mode anti-air will flow up, in radial mode it will move outwards from the center, black hole will repel it and white hole will attract it (destroying anti-air on contact).
Anti-air has the same relative weight as dust, so on contact they balance each other without passing through.
As a result of that reaction, pressure decreases by 0.5 and cold flame particles get absolute zero temperature -273.15°C.
As a result, pressure decreases by 1.