altitude

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altitude

[al′tito̅o̅d]
Etymology: L, altitudo, height
the level of elevation of any location on earth with reference to a fixed surface point, which is usually sea level. Several types of health effects are associated with altitude extremes, including a greater intensity of ultraviolet radiation that results from a thinner atmosphere. Barometric pressure decreases as altitude increases, so there are fewer molecules of oxygen. Thus breathing becomes faster & deeper, although demands of physical effort and cellular respiration are the same as at a lower altitude. High-altitude cardiac intolerance is usually worse in people with blood or pulmonary disorders. See also altitude sickness.
Altitude: relation between decreasing barometric pressure and PO2 and levels for athletic training. Broken arrow: altitude sickness possible in the unacclimatized.

altitude

the height above sea level. As atmospheric (barometric) pressure decreases progressively with increasing altitude, from the standard 1 atmosphere at sea level, the partial pressure of oxygen (PO2) decreases proportionately; the air still contains the same ∼21% of oxygen but there are fewer molecules of oxygen per unit volume. There is also a drop in temperature and humidity, but the essential problem for human life and activity is shortage of oxygen (hypoxia).

altitude,

n pertaining to any location on earth with reference to a fixed surface point, which is usually sea level. The higher the altitude, the lower the oxygen concentration and the greater the ultraviolet radiation, both of which can cause health problems.
References in classic literature ?
When one is in one of those villages it seems spacious, and its houses seem high and not out of proportion to the mountain that overhands them--but from our altitude, what a change
Unconsciousness comes quickly at this altitude," she said quietly.
At last his keen eyes picked up the ship flying at a considerable altitude far in the east.
The motor started at a touch and purred sweetly, the buoyancy tanks were well stocked, and the ship answered perfectly to the controls which regulated her altitude.
Leaping for the altitude control Gahan pulled it wide.
It was a long shot, a dangerous shot, for unless one is accustomed to it, shooting from a considerable altitude is most deceptive work.
Momentarily, Jimmie was sullen with thoughts of a hopeless altitude where grew fruit.
Speed--that's what's needed, and so are the large sustaining surfaces for getting started and for altitude.
At an altitude of several hundred feet it straightened out and went due cast.
At an altitude of five hundred feet, the pigeon drove on over the town of Berkeley and lifted its flight to the Contra Costa hills.
This implies that at altitudes where the wind velocity is double that of the velocity at an altitude of 100 meters, it would generate power which would be equal to the cube of the power generated at 100 meters.
1 ( ANI ): Insulin needs could go up or down in diabetics when they travel to high altitudes, a new study has suggested.