Typically unladen.
Tyre pressures are in the owner manual. Often there is a label on the vehicle (driver door frame, inside fuel flap etc.) that indicates laden and unladen pressures. At the air point there is often a 'Michelin' Chart that lists the pressures.
What do you mean, an African or a European Swallow
i but 44psi in my 2002 trailblazer My door tag says 32 PSI
Humidity
Humidity
Exactly what is listed in your owner's manual or on the driver's door post placard. Sometimes the placard is located in the trunk, or another place.
Mountais
Air Pressure
the eath crust
the eath crust
The air would be laden with moisture.
It is different in that the seas don't have air pressure. No air; no air pressure.