Agreed, but under lab conditions every molecule of O2 can be combusted both above and below the explosive limits. A good example of what I am refering to is the same reason we have regs O2 cleaned. While under most conditions combustion is unlikely a situation can be created where virtually everything is combustable. But as I posted earlier, any of the condition we are refering to would never result in combustion of any kind. That, however, does not mean to imply that laboratory condition can not be created where such combustion is possible. The key here is lab conditions vs. real conditions. Rarely do the two ever meet.
Sam
