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 periodicals archive ?
The plane continued to climb to its cruising altitude and finally levelled at 34,000 feet.
Cruising altitude is more efficient, but in the long run, it's not a career-winning strategy.
Flight attendants will offer customers the opportunity to upgrade at time of boarding, time permitting, or at cruising altitude.
The Mobile OnAir onboard mobile telephony system, certified by EASA (European Aviation Safety Authority) does not interfere with the radio-navigation instruments on Airbus A318 and may only be used at cruising altitude once the new illuminated sign "Switch off your phone" is turned off.
We also saw a note about extensive IFR training in the vicinity of the Drake VOR(northwest of Love Field), 10,000 feet and below, so we planned an appropriate VFR cruising altitude.
Here are a couple of examples: On a flight with a very "senior" flight crew, the pilot said: "We've reached cruising altitude and will be turning down the cabin lights.
ROUGH AND TUMBLE Jamie Osborne is unseated by Cruising Altitude in the 1990 Champion Hurdle.
A study by a team of Belfast scientists has found that oxygen levels fell by an average of 4% at cruising altitude.
On average, oxygen levels fell by 4% when people reached cruising altitude.
Bob McEwan, from the Ridgeway Veterinary Group, said: "I have screwed a few carpal knee fractures, the last of them Cruising Altitude, who, unfortunately, had to be put down, but nowadays such injuries are treated conservatively, which is six to nine months' box rest.
The Air Accident Investigation Branch said the aircraft, which was owned by Exeter-based Jersey European Airways, had taken off for a scheduled passenger flight but the flight crew experienced problems attempting to climb to their cruising altitude.
Air travel regulations meant that passengers couldn't slip out of their clothes until the jet was at cruising altitude.