1) The document is a report about measuring lift force on airfoils in a wind tunnel. It uses theoretical, empirical and computational fluid dynamics methods to calculate lift. 2) The purpose is to measure lift force on selected airfoils with uniform flow and use the results to analyze aircraft wings. It aims to compare measured lift in the wind tunnel to software calculations and theoretical results. 3) Archimedes' principle states that the buoyant force on an object equals the weight of the fluid it displaces. The upward buoyant force is calculated from pressure differences on the top and bottom of submerged objects.