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This study carried out in the context of a junior high school in the surroundings of Buenos Aires, intended to evaluate the implementation of a meaningful learning model. Such a model assumes that through appropriate instructional strategies it is possible to generate condition that favor students conceptual development, from their own conceptions to conceptually enriched conceptions. The particulate model of a gas, within the air subject, was the topic selected for the students afterdoaj:1fdb5488249441558244bcbfe841f4c1 fatcat:a7ig3o673rc73nx7gxckh4igby