It depends on how acclimatized you are. Some people in Tibet live above 13,000 with no ill effects. Other people would have difficulty in functioning, and some may actually die from HAPE, High Altitude Pulmonary Edema within hours, or days.
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At 13,000 feet, the time of useful consciousness without supplemental oxygen is around 30-60 seconds. This is the amount of time an individual can function effectively without experiencing symptoms of hypoxia due to decreased oxygen levels at that altitude.
Answer: 13000 acre = 20.3125 mi²
Mountain Time (either Mountain Standard Time or Mountain Daylight Time).
To find the partial pressure of oxygen, we first need to calculate the total pressure of the air in the airplane cabin using Dalton's law of partial pressures. Given that the atmospheric pressure at 13000 ft altitude is 650 mm Hg, the partial pressure of oxygen can be calculated as 21% of this total pressure since oxygen constitutes 21% of the air. Thus, the partial pressure of oxygen on the plane is: 0.21 * 650 mm Hg = 136.5 mm Hg.
A lightyear is a unit of distance and not time. It's the distance light travels in a year, roughly equal to 5.88 trillion miles or 9.46 trillion kilometers. Converting that to inches would result in an extremely large number that is not practically useful.
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