Quote Originally Posted by AgX View Post
That is a wrong assumption.
By time the gases mix. The heavier-than-air concept though makes substituting air by the inert gas more easy, at its best you only need as much inert gas as air-volume to be replaced.
So the inert gas would need to totally replace the air inside the top of the container, in order to be effective? One of my colleagues is mis-using the stuff, oops. Though perhaps the diffusion of the smaller volume of inert gas takes some time (more than the time between weekends anyway)? I'll stick to marbles and squeezable bottles I think.