Consider a commercial airliner flying at a speed of 540 mph (relative to the air) at an altitude of 30,000 feet. (a) Use the 1976 US Standard Atmosphere to determine the temperature, pressure, and density of air at this altitude. (b) Over a wide range of temperature, the dynamic viscosity of air follows the Suther- land Law, where μ0 = 1.716 × 10−5 Pa s, T0 = 273 K, and Sμ = 111 K. Use this to determine the air viscosity at 30,000 feet.

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Properties of Fluids

The term fluid represents a type of substance that can easily change its shape under any external pressure/force and can flow. Fluids can acquire any shape in which it is stored and can resist normal stresses but cannot resist shear stress in rest condition. Whenever external shear stress is applied to fluids, it starts to flow. The fluids may be liquid or gas. Example- water, air, etc.