How much gas does a human?

A human exhales approximately 0.5 to 1 liter of carbon dioxide (CO2) with each breath, depending on activity level and metabolic rate. Over the course of a day, this can total around 20,000 to 30,000 liters of CO2. In terms of oxygen consumption, an average adult inhales about 7 to 8 liters of oxygen per minute at rest, which varies with physical activity. However, exact amounts can differ based on individual factors such as size, health, and level of exertion.