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Hot tub
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<p>A hot tub is a large tub full of water used for <a href="/facts/Hydrotherapy/S6SzpJ7l">hydrotherapy</a>, relaxation or pleasure. Some have powerful jets for massage purposes. Hot tubs are sometimes also known as "spas" or by the trade name <a href="/facts/Jacuzzi/Up1QAcX4">Jacuzzi</a>. Hot tubs may be located outdoors or indoors. </p><p>In contrast to a typical <a href="/facts/Bathtub/8808jPhL">bathtub</a>, a hot tub is designed to be used by more than one person at a time, with many models accommodating four or more people. Unlike baths, soaps and shampoos are not used in wet-jetted hot tubs (although they can be used in air-jetted hot tubs). Home hot tubs are often closer in construction to standard bathtubs, while the construction of a public hot tub often has more in common with a <a href="/facts/Swimming_pool/32DUFtdN">swimming pool</a>, of which it can be considered a type. </p>