This unit focuses on 3 of the 5 major sacrifices offered on the Old Testament. Unlike the other 2 sacrifices, these 3 were voluntary gifts to God. Odor and fragrance falls under the Science of Chemistry.
Odors are molecules of chemicals from almost anything.
They are transmitted through the air. Most odors are created by a mixture of different molecules. We smell with our nose. When we inhale air, it goes into our nose and is instantly filtered by tiny hairs on the inside walls of each nostril. Further back in our nose is wet mucus that is warmed by blood vessels just below the surface.