How can I homogenize the mixture of gases in a small tank?

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Theodore Mill

Simply warm one side of the tank while cooling the other, the low speed convective action will fairly quickly mix the gases of the pressure is not too high,like under 10 atm

Heikki Paakkanen

Put a small flow-trough propeller inside...

Patrick Litwin

If the tank is detachable from your system, rolling it for 15 minutes should achieve homogeneity.