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Even though your lungs are inside your body they are exposed to the elements.
Your lungs have about the same volume as a football, and around 300 million tiny air chambers each on average.
If you laid all of them out on the ground they would cover a badminton court.
Each human lung holds about 3l of air.
A blue whale's lung can hold 2500l of air.
Every day you breath in and out around 25,000 times.
The average human can hold their breath for up to 60 seconds, but some have trained themselves to hold their breath for over 20 minutes!