The term standard day is used throughout meteorology, aviation, and other sciences and disciplines as a way of defining certain properties of the atmosphere in a manner which allows those who use our atmosphere to effectively calculate and communicate its properties at any given time. For example, a temperature deviation of +8 °C means that the air at any given altitude is 8 °C (14 °F) warmer than what standard day conditions and the measurement altitude would predict, and would indicate a higher density altitude. These variations are extremely important to both meteorologists and aviators, as they strongly determine the different properties of the atmosphere.
For example, on a cool day, an airliner might have no problem safely departing a medium-altitude runway, but on a warmer day, the density altitude might require a higher true airspeed, which would require more acceleration, and more runway. The pilot may be forced to reduce fuel or cargo, or even add an intermediate fuel stop, delaying the flight arrival time. In meteorology, departure from standard day conditions is what gives rise to all weather phenomena, including thunderstorms, fronts, clouds, even the heating and cooling of our planet.
Read more about Standard Day: Standard Day Parameters
Famous quotes containing the words standard and/or day:
“The art of advertisement, after the American manner, has introduced into all our life such a lavish use of superlatives, that no standard of value whatever is intact.”
—Wyndham Lewis (1882–1957)
“All my life long I have been sensible of the injustice constantly done to women. Since I have had to fight the world single-handed, there has not been one day I have not smarted under the wrongs I have had to bear, because I was not only a woman, but a woman doing a man’s work, without any man, husband, son, brother or friend, to stand at my side, and to see some semblance of justice done me. I cannot forget, for injustice is a sixth sense, and rouses all the others.”
—Amelia E. Barr (1831–1919)