07-06-2009, 07:15 PM
Quote:Even oxygen, in fact, would become toxic in a 1/3 higher than our current (~20%) concentration at sea level pressures.Really? Maybe you meant to say that if the PARTIAL pressure of O2 in our air would reach 2.5 times the current value (not 1.3), it would become unhealthy? Well, even the usual 20% is bad, if the pressure is higher (like at 66 meters below sea level). High concentrations of O2 (up to 100%) in a gas mixture of sufficient low total pressure is quite safe to breathe, though.