Lighter-than-Air Flight

Lighter-than-air flight involves vehicles, like balloons or airships, that fly because they are filled with a gas less dense than the surrounding air, such as helium or hot air. Since these gases have lower density, the overall weight of the aircraft is less than the air it displaces, creating buoyancy similar to a boat floating on water. By controlling the amount of gas or the temperature, pilots can make these craft rise, descend, or stay at a steady altitude. This principle allows lighter-than-air craft to glide through the sky without relying on aerodynamic lift like airplanes.