aerostatics

Aerostatics is a branch of physics that studies the equilibrium of gaseous fluids and solid bodies within them. It is closely related to buoyancy, which is the tendency of an object to float or rise in a fluid (liquid or gas). This phenomenon is explained by Archimedes' principle, stating that the upward buoyant force on a submerged object equals the weight of the fluid it displaces.123

Balloons, for example, utilize buoyancy. They are filled with hot air or a lighter-than-air gas like helium or hydrogen, causing them to rise and float. This principle is fundamental to understanding how objects behave in the atmosphere and is a key concept in aerostatics.4