Question

define Airfoil and Air sac ?

Answer 1

airfoil- it means the latitude of air will increase during the pressure.
air sac- it means the altitude of pressure falling by environmental condition

Answer 2

Air sac: Air sacs are spaces within an organism where there is the constant presence of air.
Airfoil: a structure with curved surfaces designed to give the most favourable ratio of lift to drag in flight, used as the basic form of the wings, fins, and horizontal stabilizer of most aircraft; an aerofoil.

Thank you