The British thermal unit (Btu) is a measure of heat, which is a form of energy. It was originally defined as the amount of heat required to raise the temperature...

radiation. It has the units square metre kelvins per watt (m2⋅K/W) in SI units or square foot degree Fahrenheit–hours per British thermal unit (ft2⋅°F⋅h/Btu)...

system of units, imperial system or imperial units (also known as British Imperial or Exchequer Standards of 1826) is the system of units first defined...

water under standard atmospheric conditions be 212 °F (100 °C). The British thermal unit (Btu) is defined as the heat needed to raise the temperature of one...

both energy and work include the foot-pound force (1.3558 J), the British thermal unit (BTU) which has various values in the region of 1055 J, the horsepower-hour...

the building industry term for thermal resistance "per unit area." It is sometimes denoted RSI-value if the SI units are used. An R-value can be given...

(dry) cord of Northern red oak with a heating value of 22.1 million British thermal units per cord (23.3 GJ/cord) has the heating equivalent of 159 U.S. gallons...

newtons. 1 kip = 1000 lbf ≈ 4.44822 kN Energy 1 foot-pound ≈ 1.356 J 1 British thermal unit (Btu) ≈ 1.055 kJ (1,054–1,060 J, depending on which of several definitions...

metre-kelvin: W/(m2⋅K) In the United States, U-value is expressed as British thermal units (Btu) per hour-square feet-degrees Fahrenheit: Btu/(h⋅ft2⋅°F) Within...

The tog is a measure of thermal insulance of a unit area, also known as thermal resistance. It is commonly used in the textile industry and often seen...