Pure oxygen can be breathed. Pure oxygen is often given to patients in hospital that have low O2 saturation.
Because too much oxygen is harmful to the environment.
Why is humidity added to the oxygen source before it is breathed by the client
Helium is breathable in the sense that it is perfectly nontoxic (it is the most inert of all elements) but of course, if you breathed pure helium you would suffer from lack of oxygen.
No, in fact most early spacecraft the test animals, astronauts, or cosmonauts breathed pure oxygen. This was stopped after the Apollo-1 fire, which was attributed to defective wiring and a pure oxygen atmosphere. After that some nitrogen was added as a safety feature against fire.
The air breathed out
The air breathed out
no it is completely different are bodies cant breathe that only pure oxygen(o2). although fish can breathe the dissolved oxygen in water
Air is breathed out of the lungs in the form of carbon dioxide. Air that is inhaled is called oxygen.
Pure oxygen is very harmful to humans at pressures higher than ground level, with the effects becoming worse the higher the pressure - ie. when scuba diving. At lower pressures, such as the cockpit of a plane at altitude, pure oxygen becomes much safer to breathe, to the point some astronauts have breathed it for around 2 weeks (at low pressure) with no detrimental effects.
Oxygen is an element and a pure substance.
Oxygen is breathed in and carbon dioxide is breathed out as it is deadly to humans. Too much carbon dioxide breathed in will cause brain damage and eventually death.
About 20%% of the air we breath is oxygen. The PaO2 (oxygen breathed in mmhg) is approximately 100 mmhg.