You searched for: “aerostatic
aerostatic (adjective), more aerostatic, most aerostatic
1. Relating to gases or resembling air; pneumatic: Such aerostatic gases, or compressed gasses, are used to propel an aircraft even under changing atmospheric flight conditions.
2. Pertaining to an aircraft, especially a dirigible: An aerostatic balloon derives its lift from the buoyancy of surrounding air rather than from the motion in the air: