Activity for John‭

Type	On...	Excerpt	Status	Date
Answer	—	A: How large does a human's plastron need to be? Lets try a quick back of the envelope calculation. A human lung is about 75 square meter,but water contains a lot less oxygen than air (1/20th) so that's about 1500 sq meters you need to get the same amount of oxygen, Area of a sphere A=4Ï€r^2. That gives us a sphere of roughly 22 meters across big... (more)	—	about 6 years ago