Aérostat

An aérostat is a type of aircraft that uses buoyant gases, such as helium or hot air, to lift off the ground. Unlike airplanes that rely on wings and engines for lift and propulsion, aérostats float because the gases inside are less dense than the surrounding air. Common examples include hot air balloons and airships (like zeppelins). They are often used for surveillance, reconnaissance, or leisure purposes due to their ability to stay aloft steadily for extended periods. Aérostats operate without internal engines, relying instead on the buoyant force generated by the gas inside their large, lightweight envelopes.