aeromechanics
noun
aero·me·chan·ics ˌer-ō-mə-ˈka-niks 
plural in form but singular or plural in construction
: mechanics that deals with the equilibrium and motion of gases and of solid bodies immersed in them
Word History
Etymology
probably borrowed from German Aeromechanik, from aero- aero- + Mechanik mechanics
First Known Use
circa 1909, in the meaning defined above