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Encyclopedia > Tog (unit)

The tog is a measure of thermal resistance, commonly used in the textile industry, and often seen quoted on, for example, duvets. Thermal resistance has two different meanings: 1) the temperature difference across the structure when a unit of heat energy flows through it in unit time or 2) the temperature difference across a unit area of a material of unit thickness when a unit of heat energy flows through it in... A textile is any type of material made from fibers or other extended linear materials such as thread or yarn (1). ...

The Shirley Institute in Britain developed the tog as an easy-to-follow alternative to the SI unit of m2K/W. Launched in the 1960s, the Shirley Togmeter is the standard apparatus for rating thermal resistance of textiles, commonly known as the Tog Test. Cover of brochure The International System of Units. ...

A tog is 0.1 m2K/W. In other words, the thermal resistance in togs is equal to ten times the temperature difference (in °C) between the two surfaces of a material, when the flow of heat is equal to one watt per square metre. The degree Celsius (°C) is a unit of temperature named after the Swedish astronomer Anders Celsius (1701–1744), who first proposed a similar system in 1742. ... The watt (symbol: W) is the SI derived unit of power, equal to one joule per second. ...

According to British retailer John Lewis, Britain-centric tog guidelines for duvets are as follows:[1] One of John Lewis flagship branches in Glasgows Buchanan Galleries mall The John Lewis Partnership is a major United Kingdom retailer, operating department stores and, through its Waitrose subsidiary, upmarket supermarkets. ... The current climate of United Kingdom is classified as temperate, with warm summers, cool winters and plentiful precipitation throughout the year. ...

Lightweight summer duvet: 4.5 tog
Spring/Autumn weight duvet: 9.0 - 10.5 tog
Winter weight duvet: 12.0 - 13.5 tog

Another unit of thermal resistance of textiles is the clo, equal to 1.55 togs (1 tog = 0.645 clo).[2]


  1. ^ John Lewis Partnership website[1]
  2. ^ Cornell University Ergonomics Web [2]



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