The hot air balloon is one example of an aerostat.
an airship, balloon, or other aircraft that is lifted and sustained by means of one or more containers filled with a gas lighter than air
Origin of aerostatFrench aérostat: see aero- and amp; -stat
An aircraft, especially a balloon or dirigible, deriving its lift from the buoyancy of surrounding air rather than from aerodynamic motion.
Origin of aerostatFrench aérostat : Greek āero-, aero-; see aero– + Greek statos, standing; see stato–.
- aer′o·stat′ic, aer′o·stat′i·cal