What is in perfume?
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Perfume is a mixture of fragrant essential oils and aroma compounds,fixatives,and solvents.
What is essential oil?
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A liquid that is usually distilled(mostly by water) from the stems,roots,bark,leaves,peddles and other parts of a plant.
What are aroma compounds?
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Aroma compounds (also known as aroma, oderant, flavor or fragrance) is just a chemical compound that has an odor or smell.
What is a fixative?
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It's something that protects or preserves a liquid mixed with perfume to prevent evaporation.
The Process of Smelling
http://www.youtube.com/watch?v=07W6ObV0eeI&feature=player_detailpage