High Quality Content by WIKIPEDIA articles! Limiting oxygen concentration, (LOC), also known as the Minimum oxygen concentration, (MOC), is defined as the limiting concentration of oxygen below which combustion is not possible, independent of the concentration of fuel. It is expressed in units of volume percent of oxygen. The LOC varies with pressure and temperature. It is also dependent on the type of inert (non-flammable) gas. The effect of increasing the concentration of inert gas can be understood by viewing the inert as thermal ballast that quenches the flame temperature to a level below which the flame cannot exist.. Carbon dioxide is therefore more effective than nitrogen due to its higher molar heat capacity

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