aerostatics
/ˌɛːrə(ʊ)ˈstatɪks/noun
With singular concord. The branch of physics that deals with the equilibrium properties of air and (now historical ) with the behaviour of objects suspended in it.
Origin
Late 18th century; earliest use found in Thomas Martyn (1735–1825), botanist. From aerostatic: see -ic. Compare French aérostatique. Compare aerostation and earlier aerostatica.