An odor or odour (see spelling differences In the early 18th century, English spelling was not standardised. Differences became noticeable after the publishing of influential dictionaries. Current British English spellings follow, for the most part, those of Samuel Johnson's Dictionary of the English Language , whereas many American English spellings follow Noah Webster's An American) is caused by one or more volatilized chemical compounds A chemical compound is a pure chemical substance consisting of two or more different chemical elements that can be separated into simpler substances by chemical reactions. Chemical compounds have a unique and defined chemical structure; they consist of a fixed ratio of atoms that are held together in a defined spatial arrangement by chemical bonds, generally at a very low concentration, that humans or other animals perceive by the sense Senses are the physiological methods of perception. The senses and their operation, classification, and theory are overlapping topics studied by a variety of fields, most notably neuroscience, cognitive psychology , and philosophy of perception. The nervous system has a specific sensory system, or organ, dedicated to each sense of olfaction Olfaction is the sense of smell. This sense is mediated by specialized sensory cells of the nasal cavity of vertebrates, and, by analogy, sensory cells of the antennae of invertebrates. Many vertebrates, including most mammals and reptiles, have two distinct olfactory systems - the main olfactory system, and the accessory olfactory system (mainly. Odors are also called smells, which can refer to both pleasant and unpleasant odors An unpleasant odor is an odor that is viewed as repulsive to one or more persons. Such an odor may or may not be attractive to others. Different types of odors may be viewed as pleasant or unpleasant to different people. The terms fragrance, scent, and aroma are used primarily by the food and cosmetic industry to describe a pleasant odor, and are sometimes used to refer to perfumes Perfume is a mixture of fragrant essential oils and aroma compounds, fixatives, and solvents used to give the human body, animals, objects, and living spaces a pleasant scent. In contrast, malodor, stench, reek, and stink are used specifically to describe unpleasant odors An unpleasant odor is an odor that is viewed as repulsive to one or more persons. Such an odor may or may not be attractive to others. Different types of odors may be viewed as pleasant or unpleasant to different people.
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It had a mild odor , smelling vaguely of wet cement. Dirty fingerprints didn't go away when I wiped them with the soft side of a scrubber sponge, ...
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