<p>The paper calculates the lift force of an aerodynamic profile at a zero angle of attack at low speeds relative to the speed of sound. It is demonstrated that at subsonic speeds, the lift force is fundamentally driven by the compressibility of air. Due to air compressibility in front of the wing, the air pressure difference becomes smaller than the difference in the air’s kinetic energy density, as the internal energy increases due to compression. For a wing to generate lift, the flow velocity must be higher beneath the wing, while the air pressure must be higher above the wing. In this case, a force equal to the difference in the kinetic energy density of the air compensates for both the air pressure difference and the dynamic pressure on the wing caused by the profile asymmetry, thereby generating the lift force. The paper provides a calculation of the lift force for a triangular wing profile at a zero angle of attack.</p>