You searched for: “aerostatics
aerostatics (s) (noun) (no pl)
1. The study of gases that deals with the balance of air or other gases, and with the equilibrium of solid bodies: Arthur decided to study aerostatics because he was very interested in the principle of floatation in air.
2. The science of aircraft that are lighter than air: Greg thinks that aerostatics seems to be a fascinating branch of research dealing with dirigibles and balloons, both of which are buoyant and float or drift in the atmosphere.