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.

noun (functioning as singular)

  1. the study of gases in equilibrium and bodies held in equilibrium in gasesCompare aerodynamics
  2. the study of lighter-than-air craft, such as balloons

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