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Density of a fluid is the mass divided by the volume. Some fluids are denser than others; for example, water is much denser than air, since one cubic centimeter of water has much more mass than one cubic centimeter of air. Since air is compressible, air at higher pressure is also denser than air at lower pressure. Viscosity is an entirely separate property of a fluid. It is more complicated to define and describe viscosity entirely accurately. Roughly speaking, viscosity is a measure of how hard you have to push a fluid to get it to flow. For example, it is much harder to push honey through a small hole than it is to push air through the same hole, because the viscosity of honey is much higher than that of air.

Unfortunately, there is not a simple formula to calculate stall angle.

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