Air at 18000 ft is much less dense therefore making it harder for the hujman body to intake oxygen and filter it through the lungs.
Air pressure can be modeled as column in that the lower the column regards the more of it pressing down upon you. Therefore, someone standing at sea level has a more air pressure pushing down on them then someone at high altitude (as in a mountain).
Air pressure is greatest at ground level because the weight of the air above compresses the air molecules closer together, creating higher pressure. As altitude increases, there is less air above, resulting in lower air pressure.
1 Bar represents one atmosphere of air pressure. 10 Bar is approximately equal to 100 Meters of water depth. 1 meter = 3.28083989501 feet. It follows that 100 meters = 328.083989501 feet. Therefore, 10 Bar is approximately equal to the expected pressure at 328.083989501 feet of water depth (not sea level).
Altocumulus and altostratus clouds can be found between 20,000 and 6,500 feet in the air. Altocumulus clouds are white or gray with patchy cloud layers, while altostratus clouds are gray or blue-gray and cover the sky with a veil-like appearance.
The air pressure at sea level is typically around 1013 millibars or 29.92 inches of mercury.
The air density at 18,000 feet above sea level is approximately 0.65 kg/m^3. At higher altitudes, the air density decreases due to the lower pressure and lower temperature.
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The air pressure at 18,000 feet is approximately 54% of the air pressure at sea level. This decrease in air pressure is due to the decrease in the weight of the air column above as altitude increases. At 18,000 feet, the air pressure is lower, which can impact breathing and altitude sickness in individuals not acclimated to high elevations.
The atmoshperic pressure at 18,000 feet above sea level is 280 mm Hg.
mid level clouds.
The installation manual will tell you what size lines are acceptable.
I would not use an air source heat pump in Potomac Md also you will probably need more than 1 unit for 18000 sq ft of living space.
It is much closer to the ground.
mid level clouds.
At 7200 feet, the oxygen level is lower compared to sea level because the air pressure is reduced at higher altitudes. This decrease in oxygen level can lead to symptoms of hypoxia such as shortness of breath, fatigue, and dizziness.
== == Cold air is more dense than the room temperature air so it drops to ground level where your bare feet just happen to be.
18000 miles per hour by the space shuttle