Previous Post You know how, in most depictions of Superman’s super-breath, he just expels a huge volume of air, but he’s never shown inhaling an equal volume of air beforehand? Sometimes he might be shown taking a quick breath right before, but it’s never anywhere near the same amount of air as he exhales. So like, where does all that air come from? Does he just magically create air inside himself? Does the mass of Earth’s atmosphere continually increase every time he does it?

1) It's fiction! Just relax and enjoy it!

2) If we do hazard an estimation, it would be that Superman never stops inhaling even though exhaling. His Kryptonian physiology allows him to take in continuously more air through his nostrils, while expelling gale force winds from his mouth.

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3) As Superman doesn't need to breathe, and only does so out of human mimicry, all of the air he take in resides in his lungs, being compressed over time, so we see as a simple draw of breath, is added to days, weeks, or months of air stored in his lungs

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4) What we see being expelled isn't actual air, but force that closely resembles it. A short draw of breath, thanks his Kryptonian physiology is converted into a force that much resembles a hurricane's power, but isn't actually breath being expelled.

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Come up with your own theory. All of Superman's powers defy our knowledge of physics, so there's really no right or wrong answer, just what appears to be more plausible.