A method and an apparatus for carrying out, at least two fluidized beds (4, 5), different chemical and/or physical processes between a heavier medium and two or more mutually different, lighter fluidizing media (F1, F2), for example combustion and gasification of solid fuel by means of air and water vapour, respectively. The beds are disposed spaced from each other but with an open communication between them at their lower ends and the one fluidizing medium (F1) is utilized for circulation of the heavier material (H) between the beds. This one fluidizing media (F1) is blown in at the open communication such that it does not mix with the other fluidizing media of the beds and the fluidizing media are led off from the beds in separate paths (16, 19).
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