doxin:
The maker of TPT did a great job, most of fondamentals thermodynamics law are respected. But energy conservation is not.@doltox (View Post)
I can assure you that the people who collaborated to make TPT know their physics quite well. I can't tell you the reason why the pressure dissapears, but I'm sure that whoever programmed it had his reasons.
It's a deliberate effect (but don't ask me why TPT air physics was made like this, because I don't know...). Every frame, pressure goes closer to zero by 0.01% of its current magnitude.
The line responsible is "pv[y][x] *= AIR_PLOSS;"
Although for some reason, with that removed, pressure still decreases very slowly. Possibly due to numerical inaccuracies somewhere.