Final answer:
The first aid oxygen requirements for flights with a cabin pressure at 8,000' or higher are not specified, but high altitudes require careful consideration of oxygen supply due to lower atmospheric pressure and partial pressure of oxygen. Mountain climbers need to calculate their oxygen needs, and the partial pressure of oxygen must be maintained for physiological health.
Step-by-step explanation:
First aid oxygen requirements for a 704 Operation (which typically refers to commercial aviation operations under certain regulations, though the context here is unclear) for flights with a cabin pressure at 8,000' or higher are not specified in this context. However, we can discuss the oxygen needs of individuals in high-altitude environments, such as mountain climbers and the effects of high-altitude on the body, which relates to pressure and oxygen levels. When at high altitudes, the availability of oxygen is lower due to decreased atmospheric pressure. This means that the partial pressure of oxygen is reduced, making it harder for the body to absorb oxygen.
For mountain climbers, carrying bottled oxygen can be critical. The climber must calculate the oxygen needed based on the climber's rate of oxygen consumption and the duration of the climb. For instance, if a mountain climber uses oxygen at twice the rate for climbing 116 stairs per minute and climbs for 10 hours, and knowing that only 40% of inhaled oxygen is utilized, the calculation would determine the total liters of oxygen needed at sea level.
Understanding the partial pressure of oxygen is also important. For example, atop Mt. Everest, the atmospheric pressure is significantly lower than at sea level. To maintain the same partial pressure of oxygen as at sea level, climbers would need to breathe air with a higher percentage of oxygen.
Lastly, high altitude can lead to the drying of breathing passages because of the low humidity and temperature, as well as altitude sickness due to changes in blood pH and bicarbonate levels caused by lowered Pco2 levels at high elevations. These physiological responses to high altitude emphasize the importance of sufficient oxygen supply for individuals in these environments.