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Hydrogenation is a chemical process in which hydrogen gas is bubbled through a liquid oil in the presence of a catalyst, often a reactive metal such as platinum or nickel. The resulting reaction forces unsaturated fatty acids to accept additional hydrogen atoms and become at least partially saturated.
Sunflower oil is also sometimes hydrogenated, a process by which hydrogen is added to oils to change their texture. The chemical process of hydrogenation produces saturated fats, while partial hydrogenation produces trans fats. In both cases, hydrogenation allows liquid oils to stay solid at room temperature.