A perfume is a mixture of aromatic essential oils or fragrances (fragrances), preservatives and solvents, usually in liquid form, that is used giving the human body, animals, food, things and shelter a pleasant fragrance. Incense can be defined as something that emits and spreads a pleasant, sweet smell. They are made with aromatic chemicals and essential oils. The winner of the 1939 Nobel Prize in Chemistry, Leopold Ružička, said in 1945 that "from the first period of scientific chemistry to the present, perfume has contributed greatly to the development of organic chemistry in terms of methods, structure in theory.
