British Thermal Unit, 1.28

British thermal unit (Btu) The most commonly used industrial heal unit the amount of heat required to raise 1 lb of water through UF under specified conditions. Since the specific heat of water varies, particularly with temperature, the actual value of Btu is dependent on the conditions chosen as stan-... 

Common combustion reactions and heat releases for 0.454 kg of reactant under ideal combustion conditions are as follows, where Btu represents British thermal unit ... 

British thermal unit (ISO/ joule +03 1.055 06 grain kilogram -05 6.479 891... 

British thermal unit joule +03 1.055 04 hand meter -01 1.016... 

British thermal unit (mean) joule +03 1.055 87 henry (international of 1948) henry +00 1.000 495... 

British thermal unit (39 F) joule +03 1.059 67 horsepower (boiler) watt +03 9.809 50... 

British thermal unit (60 F) joule +03 1.054 68 horsepower (electric) watt +02 7.46... 

Table 1-7 provides a number of useful conversion factors. To make a conversion of an element in U.S. customary units to SI units, one multiplies the value of the U.S. customary unit, found on the left side in the table, by the equivalent value on the right side. For example, to convert 10 British thermal units to joules, one multiplies 10 by 1054.4 to obtain 10544 joules. 

To convert calories per gram-mole to British thermal units per... 

To convert calories per gram-kelvin to British thermal units per pound-degree Ranldne, multiply by 1.0 to convert calories per gram-mole-kelvin to British thermal units per pound-mole-degree Ranldne, multiply by 1.0. 

To convert kilojoules per Idlogram-kelvin to British thermal units per pound-degree Ranldne, multiply by 0.2388. 

F = °C -h 32 to convert kilocalories per gram-mole to British thermal units per pound-mole, multiply by 1.799 X 10". ... 

Thermal conductivity to convert watts per meter-kelvin to British thermal unit-feet per hour-square foot-degree Fahrenheit, multiply by 0.57779 and to convert British thermal unit-feet per hour-square foot-degree Fahrenheit to watts per meter-kelvin, multiply by 1.7307. Viscosity to convert pascal-seconds to centipoises, multiply by 1000. 

NOTE Difficulties of accurately characterizing many of the specimens mean that many of the values presented here must he regarded as being of order of magnitude only For some materials, actual measurement may he the only way to obtain data of the required accuracy To convert kilograms per cubic meter to pounds per cubic foot, multiply hy 0.062428 to convert kilojoules per Idlogram-kelvin to British thermal units per pound-degree Fahrenheit, multiply hy 0.23885. 

FIG. 5-7 Radiation coefficients of heat transfer h,.. To convert British thermal units per hoiir-sqiiare foot-degrees Fahrenheit to joules per square meter-second-kelvins, multiply by 5,6783 = ( F — 32)/l,8,... 

NOTE To convert British thermal units per hour-square foot-degrees Fahrenheit to joules per square meter-second-kelvins, multiply hy 5.6783. 

To convert British thermal units per hour-square foot-degrees Fahrenheit to joules per meter-second-kelvins, multiply hy 1.7307 to convert British thermal units per ciihic foot-degrees Fahrenheit to joules per ciihic meter-kelvins, multiply hy (6.707)(10 ) and to convert square feet per hour to square meters per second, multiply hy (2.581)(10 ). 

Aluminum-jacketed calcium silicate insulation with an emissivity factor of 0.05. To convert inches to miUimeters, multiply by 25.4, to convert dollars per 1 miUion British thermal units to dollars per 1 nulhon kilojoules, multiply by 0.948, = 5/9 ( F — 32). 

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