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Hi everyone, welcome back to my channel! Did you ever wonder why airplanes fly at the altitude they fly at? Why don’t they just go a few levels lower or fly at the altitude that clears all obstacles? There are a few reasons for that and in this video I will point them out.
The higher a plane flies, the thinner the air is. With the increase in altitude, the density of air decreases. The reduced density means a lower number of air molecules entering the core engine. For the fuel/air mixture to maintain its required ratio, the required number of fuel molecules must decrease to meet the decreased number of air molecules. This results in a lower amount of fuel required at higher altitudes to get the same speed. The negative side of this is that there are also fewer oxygen molecules to combust with fuel, so less power is generated. Higher altitudes also require a longer climb, which means the airplane burns more fuel to reach its cruising altitude. Basically you need to find an altitude where you are flying as fast as possible but burning the least amount of fuel. This altitude lies for many jet airplanes between 30.000 and 41000 feet. The ideal altitude depends on a few things, such as the atmospheric conditions, distance from A to B, flight direction, weight and type of airplane. With atmospheric conditions I mean the height of the tropopause, Clear air turbulence or strong high head/tailwinds.
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Airplanes Fly High - This Is Why
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