As a respiratory physiologist, I can tell you that the amount of oxygen a person needs per minute can vary significantly based on factors such as age, health, activity level, and environmental conditions. On average, at rest, an adult might consume about 550 liters of oxygen per day, which translates to approximately 9 to 10 liters per hour or roughly 0.15 to 0.17 liters per minute. However, during physical activity or in conditions of increased metabolic demand, this requirement can increase substantially.

During intense exercise, oxygen consumption can rise to 100 to 200 times the resting rate. For example, a well-trained athlete may require up to 4 to 5 liters of oxygen per minute during maximum exertion. It's important to note that the human body has mechanisms to adjust to varying oxygen demands, including increased breathing rate and depth.

In summary, while the average resting oxygen consumption is around 0.15 to 0.17 liters per minute, it can increase dramatically based on the individual's activity and physiological needs.

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A person breathes 7 or 8 liters of air per minute. Air is about 20% oxygen. But when you exhale, your breath is about 15% oxygen, so you consumed about 5%. Therefore, a person uses about 550 liters of pure oxygen each day.read more >>