Did you ever counted how many times you breathed today? You might say that it's a little less than impossible task, but for your knowledge, according to a research, a normal human being breathes about 20,000 times in a day. Taking the average of 960 breathes an hour, a person would breathe about 8,409,600 times in an year. If a person lives to 80, they would take about 672,768,000 breathes in a lifetime. How much air passes through your lungs everyday? The average adult while at rest inhales and exhales about 7 or 8 litres of air per minute. That totals about 11,000 litres of air per day. Inhaled air is about 20% of oxygen and exhaled air is about 20% oxygen. Know about the cancer in lungs, Mesothelioma, Mesothelioma Compensation and Mesothelioma survival rates here . Is pure oxygen deadly? We breathe air that is 20-21% oxygen, and we require oxygen to live. So you might think that breathing 100% oxygen would be good for us, but actually it can be ha...