U+1F4A6 Splashing Sweat Symbol

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Perspiration, also known as sweat, is the fluid secreted by sweat glands in the skin of mammals.

Two types of sweat glands can be found in humans: eccrine glands and apocrine glands. The eccrine sweat glands are distributed over much of the body and are responsible for secreting the watery, brackish sweat most often triggered by excessive body temperature. Apocrine sweat glands are restricted to the armpits and a few other areas of the body and produce an odorless, oily, opaque secretion which then gains its characteristic odor from bacterial decomposition.

In humans, sweating is primarily a means of thermoregulation, which is achieved by the water-rich secretion of the eccrine glands. Maximum sweat rates of an adult can be up to 2–4 litres (0.53–1.06 US gal) per hour or 10–14 litres (2.6–3.7 US gal) per day, but is less in children prior to puberty. Evaporation of sweat from the skin surface has a cooling effect due to evaporative cooling. Hence, in hot weather, or when the individual's muscles heat up due to exertion, more sweat is produced. Animals with few sweat glands, such as dogs, accomplish similar temperature regulation results by panting, which evaporates water from the moist lining of the oral cavity and pharynx.

Although sweating is found in a wide variety of mammals, relatively few (apart from humans, horses, some primates and some bovidae) produce sweat in order to cool down. In horses, such cooling sweat is created by apocrine glands and contains a wetting agent, the protein latherin which transfers from the skin to the surface of their coats.