Aerosols are divided systems in which liquid and/or solid particles evolve in a continuous gas phase. They are naturally subject to the influence of gravity, which determines the settling speed of the particles they contain. Aerosols have many applications in the pharmaceutical and cosmetic industries (inhalers, sprays), in metallurgy (spray drying) and in agriculture (pesticides). From an academic point of view, they are the subject of intense research activity. The description of their evolution is, for example, a major issue in climatology. With global warming, more water is evaporatingin the air resulting in more cloud formation and a higher importance of cloud microphysics in the understanding of the climate evolution. In this context, CNES has recently supported the development of a new instrument allowing not only to produce aerosols under controlled thermodynamicconditions but also to follow their evolution in microgravity. This work presents results of parabolic flight experiments. It demonstrates the possibility of producing aerosols and to investigate their properties with optical microscopy for periods of about twenty seconds.