aqualung, snorkle, SCUBA tank
I heard that they recorded a scuba diver breathing underwater
It's called an aqualung
The diver uses an air tank, which is a tank filled with compressed air. It has a hose that goes from the tank to the mouth, which is held in the mouth by a 'mouth piece'. The tank has a regulator that allows the pressure in the tank to be regulated down for normal breathing.
diver
Becasue if a SCUBA diver didn't go underwater, they really wouldn't be a SCUBA diver. SCUBA stands for Self-Contained Underwater Breathing Apparatus.
If helium replaces the nitrogen in normal air, the pitch of the diver's voice will increase considerably.
Aqualung.
a breathing tank! try it its fun! (underwater swimming)
A SCUBA (self-contained underwater breathing apparatus) tank
It depends on how deep the diver goes, and what air blend the diver is breathing. There are dive tables that state how long a diver can stay at a certain depth before requiring decompression. The basic recreational diver typically breathes either air or Nitrox. There are separate dives tables for air and Nitrox.
The answer to the question what partial pressure of oxygen is a scuba diver breathing if the total pressure is 6.3 atm and 20 % of the air is oxygen is 1.26 atm (atmospheres).