How You Breathe Out · Lungs
About a litre always stays behind — on purpose.
Breathe out as hard as you possibly can, until your chest aches. There is still around a litre of air inside you, and no amount of effort will shift it.
There's more: about a litre always stays behind — on purpose. The full explanation — and the interactive version you can tap and quiz yourself on — lives in the app.
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