aerostatics

[air-uh-stat-iks] /ˌɛər əˈstæt ɪks/
noun, (used with a singular verb)
1.
the branch of statics that deals with gases in equilibrium and with gases and bodies in the gases in equilibrium with one another.
Compare aerodynamics.
2.
the science of lighter-than-air aircraft.
Origin
1745-55; see aerostatic, -ics
British Dictionary definitions for aerostatics

aerostatics

/ˌɛərəˈstætɪks/
noun (functioning as sing)
1.
the study of gases in equilibrium and bodies held in equilibrium in gases Compare aerodynamics
2.
the study of lighter-than-air craft, such as balloons