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This detection method is based on the effect of magnetic lines of flux on oxygen molecules. The oxygen molecules tend to pool around the high intensity flux lines.  A test body (a.k.a., dumb-bell), filled with nitrogen, is placed within the high intensity lines of flux; as the concentration of oxygen increases from 0.00% to 100.00%, the bouyancy of the nitrogen filled spheres increases as oxygen concentration increases.  The force developed by the bouancy is measured and a proportional signal is developed.