There are about as many atoms of air in our lungs at any moment as there are breaths of air in the atmosphere of

Question

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The atmosphere contains about 2.5 x 10^22 atoms of air and the average person takes around 20,000 breaths per day. Therefore, there are approximately 5 x 10^27 breaths taken per day by all humans. This means that at any given moment, there are approximately 1.26 x 10^6 atoms of air in our lungs (assuming each breath takes in about 500 mL of air). Since there are around 7.5 billion people in the world, the total number of atoms of air in our lungs at any moment would be around 9.45 x 10^12, which is roughly equal to the number of breaths of air in the entire world. Therefore, the best choice is D) the whole world.

There Are About as Many Atoms of Air in Our