To better understand the reasoning for this, you should initially look at the Earth’s setting. The tropospright here is the lowest level of Earth’s setting. Above it, however, is the stratospbelow, complied with by the stratopausage and also then the mesospbelow. Commercial jets can certainly fly above or below the troposphere, but this layer of the atmosphere supplies best flying conditions for several reasons.
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First, the tropospbelow produces minimal drag or resistance for commercial jets. If commercial jets flew listed below the tropospbelow, they would certainly burn even more fuel because of the increased drag at reduced altitudes. This is because air is thicker at reduced altitudes, requiring commercial jets to expend more power to “push” themselves with the skies. In the tropospright here, but, the air is thinner, thereby making commercial flights even more fuel reliable.
Upon analysis that, you could be wondering why commercial jets don’t fly in better levels of Earth’s atmosphere choose the stratospright here or mesosphere. After all, if air gets thinner at greater altitudes, standard wisdom may lead you to think that flying in the stratospbelow would provide also greater fuel efficiency benefits than flying in the tropospbelow. Well, the trouble via flying over the troposphere is that the air is too thin to develop any extensive amount of lift for commercial jets. And if a commercial jet doesn’t develop enough lift, it won’t be able to sustain its cruising speed.
Of course, tright here are exceptions, such as army aircraft. Many type of army aircraft are designed through bigger wings than commercial jets, enabling them to produce even more lift from much less air. These army aircraft are able to fly over the tropospbelow while creating an sufficient amount of lift from the otherwise thin air.
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The following time you take a commercial trip, pay attention to the jet’s cruising altitude. You’ll more than likely find that it flies somewright here in the tropospright here, which is important for two reasons: the air is thin sufficient to minimize drag, yet it’s also thick enough to develop an sufficient amount of lift. For these reasons, commercial jets practically constantly fly in the tropospright here.