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( Odor) An odor or odour (see spelling differences) is a volatilized chemical compound, generally at a very low concentration, that humans or other animals perceive by the sense of olfaction. Odors are also called smells, which can refer to both pleasant and unpleasant odors. 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. In contrast, malodorous, stench, reek, and stink are used specifically to describe unpleasant odors.

The widest range of odors consists of organic compounds, although some inorganic substances, such as hydrogen sulfide and ammonia, are also odorants. The perception of an odor effect is a two-step process. First, there is the physiological part; the sense of the stimulus by receptors in the nose. After that, the psychological part follows. The stimuli are processed by the region of the human brain which is responsible for smelling. Because of this, an objective and analytical measure of odor is impossible. While odor feelings are very personal perceptions, individual reactions are related to gender, age, state of health, and private affectations. Common odors that people are used to, such as their own body odor, are less noticeable to individuals than external or uncommon odors.

For most people, the process of smelling gives little information concerning the ingredients of a substance. It only offers information related to the emotional impact. Experienced people, however, such as flavorists and perfumers, can pick out individual chemicals in complex mixes through smell alone.

In Germany, the concentrations of odorants have since the 1870’s been defined by the “Olfaktometrie”, which helps to analyze the human sense of smell using the following parameters odor substance concentration, intensity of odor, and hedonic assessment.

Odor Subcategories Odor Articles Body Care Products for a Healthy and Beautiful You!! by chelsi woolz A beautiful body is a sign of good health. If you want people to notice you and appreciate your flawless beauty, it is essential to take good care of your body. There is nothing better than maintaining a healthy lifestyle by eating healthy f... Hot Tips to make Hair Conditioner at Home by jessica thomson Most of us pay outrageous prices for hair products, when we can easily make our own home made hair conditioner, which is more effective and safe as compared to the one available in the parlous and salons. One can make these easily from those ingredie... Vaginal Odor May Cause Serious Problems If Left Untreated by Raphaelo Steff Vaginal odor may limit sexual activity in a relationship; the woman feels uncomfortable, and the man becomes a little distant. However, the vagina has a distinct smell that is not a problem. Each girl has a particular vaginal smell; it is natural. ... Woman health and beauty tips by Raphaelo Steff Being a woman is more than having feminine organs, is learning to understand your body at different stages of life and anticipate the small ailments before they become real problems. Your body’s needs when you were a 17-year-old girl cannot be the ... More men opting for skincare products by Matthew Pressman The days of ‘men being men’ and shunning cosmetic products are numbered, according to recent research which has revealed that men are buying more skincare products than ever before, and are also devoting more time and money to their personal gro... 10 Step Guide to Avoiding A Person With Bad Breath by kathryn S. carrington 10 Step Guide to Avoiding a Person with Bad Breath Can anyone define for me the definition of Bad Breath? I define it as someone with unpleasant and terribly offensive breath odor. If the person consistently has this of... Loss of Odor Perception Might Signal Alzheimer's by Ed Bagley edbagley1@juno.com. Best regards Ed Bagley http://www.edbagleyblog.com Loss of Odor Perception Might Signal Alzheimer's Copyright © 2007 Ed Bagley Imagine my recoil when I read the above Associated Press headline recently. T... Skin Care - Control Body Odor by cd mohatta Sweat controls our body temperature. Sweat also is responsible for body odor. When bacteria react with sweat, it produces odor. Similarly pheromones that are emitted by apocrine glands also have an odor. Let us find out how to control excess sweat an... Body odor can be eliminated through a change in diet by Mike Adams Copyright 2006 Truth Publishing This article touches on a subject that's quite sensitive to many people: body odor. Let's explore the link between the foods you choose to consume and the odor produced by your body (there is a direct correlation... Eliminate Underarm Odor - Naturally! by Mike Ramsey When we suffer from underarm odor, most of us become desperate to find ways to eliminate it completely. And there are a number of ways to eliminate underarm odor. One of the simplest ways to get rid of it is to wash your body with both soap and water...