Abstract: The invention concerns a method for generating a cold plasma for sterilizing a gaseous medium and a device therefor. The inventive device comprises a confinement chamber (1) including at least one treatment chamber (40), means (4) for generating a first uniform magnetic field (B1), means (5) for generating a second uniform magnetic field (B32), means (6, 7) for emitting an electromagnetic signal (EM1), means (9, 10) for generating one or several second electromagnetic fields (E2) in the plasma and a powering system (14) controlling the value of the first and second magnetic fields (B1, B2) and the frequency and the amplitude of the alternating current voltages (V6, V7).

Abstract: The invention concerns a packaging material comprising two layers delimiting between them a cavity. A substance capable of retaining gas therein is housed in the cavity and one of the layers is permeable to gas ethylene and impermeable to water vapour.