Why is it impossible while 5m or more below water to breathe through a hose connected to the surface air, but easy to breathe through a scuba?

Question

Why is it impossible while 5m or more below water to breathe through a hose connected to the surface air, but easy to breathe through a scuba?

In: 158

Answer 1

In my scuba class we learned the co2 you breathe out would sit in the tube. It’s more dense than normal air, so your tube wouldn’t actually get surface air