Reynolds number is extremely important to aerospace engineer majors. The point at which air flow over an airfoil (wing) transitions from laminar flow to turbulent flow is the Reynolds number. In other words it is a ratio of inertial forces to viscous forces. As far as airfoil testing is concerned sea level is best. That way air can be treated as a liquid.
Sea level is the average level where the oceans meet the land. This is important for aircraft because sea level and atmospheric pressure is used for the altimeter. An altimeter uses sea level to estimate the altitude the aircraft is flying. On the ground the atmospheric pressure is 29.92 inHg (inches of mercury)
Also known as barometric pressure. At sea level is 14.7 psi (pounds per square inch). The higher in altitude, the lower the pressure. Highest pressure is in Siberia. Lowest pressure is in the middle of tropical cyclones or tornados.
A tornado is a column of rotating air between a cloud and the ground. In the northern hemisphere they always rotate counter clockwise. In the southern hemisphere they always rotate clockwise. The Fujita scale is one of the more common rating scales for damage that a tornado causes. A tornado family is when one storm cell forms more than one tornado.
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