# How much oxygen do we inhale and exhale?

## How much oxygen do we inhale and exhale?

The average adult, when resting, inhales and exhales about 7 or 8 liters of air per minute. That totals about 11,000 liters of air per day. Inhaled air is about 20-percent oxygen. Exhaled air is about 15-percent oxygen.

### What percent of the air we exhale is oxygen?

Inhaled and exhaled air

Gas \% in inhaled air \% in exhaled air
Oxygen 21 16
Carbon dioxide 0.04 4
Nitrogen 79 79
NB These figures are approximate.

How much oxygen is found in the air we breathe?

Air is mostly gas It’s a mixture of different gases. The air in Earth’s atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of lots of other gases, too, such as carbon dioxide, neon, and hydrogen.

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How much air do you exhale per breath?

Tidal volume (TV) is the amount of air breathed in with each normal breath. The average tidal volume is 0.5 litres (500 ml). Minute ventilation (VE) is the total volume of air entering the lungs in a minute. The average minute ventilation is 6 litres per minute.

## How much moisture do we exhale?

As we exhale, our body moistens the surfaces of our lungs and the air we exhale, now warmed to approximately 90F has a relative humidity of almost 100\%. At 90F and 90\%, each gram of dry air we exhale (that is, the air we exhale minus the weight of the water vapor in it) also carries with it 0.0272 grams of water vapor.

### How much CO2 do we exhale per minute?

The ideal gas law tells us that a person consumes about 0.012-0.014 moles of O2 per minute. We know that the molecular weight of CO2 is 44.0095 (12.0107 for Carbon + 2*15.9994 for Oxygen), so that they are exhaling between 0.5 and 0.6 grams of CO2 per minute.