Aeromodelling is an activity of designing, building, and flying of model airplanes, helicopters and anything else that flies. It is an international hobby and sport. You get to express your creativity in the aircraft you create and have opportunities to prove their air-worth in local and international competitions.
A science fair experiment is generally a competition where contestants present their science project, results in the form of a report, display board, and/or models that they have created. Science fairs allow students in elementary, middle and high schools to compete in science and/or technology activities. The main motive of a science fair is for students to answer a question or task, not from a textbook but found out themselves by conducting a range of experiments and ongoing research in the short amount of time allocated to them
An exhibition, in the most general sense, is an organised presentation and display of a selection of items. ... Exhibitions range from an extraordinarily large event such as a World's fair exposition to small one-artist solo shows or a display of just one item.