equivalent head wind"The equivalent longitudinal wind that opposes the flight of an aircraft. See equivalent tail wind.
The opposite of a head wind. Teardrop balloon A sounding balloon which, when operationally inflated, resembles an inverted teardrop.
Head Wind: When facing into the wind the wind is coming toward you.
Heat: Anything that does work produces heat.
Hear Equator: An area at about 10 degs. N. Latitude with high yearly average temperatures.
 See also: Water, Wind, Surface, Atmosphere, Air
  
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