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Chilton–Colburn J-factor analogy (also known as the modified Reynolds analogy [1]) is a successful and widely used analogy between heat, momentum, and mass transfer.The basic mechanisms and mathematics of heat, mass, and momentum transport are essentially the same.
The precise equivalence between calories and joules has varied over the years, but in thermochemistry and nutrition it is now generally assumed that one (small) calorie (thermochemical calorie) is equal to exactly 4.184 J, and therefore one kilocalorie (one large calorie) is 4184 J or 4.184 kJ.
In particular Joule had experimented on the amount of mechanical work generated by friction needed to raise the temperature of a pound of water by one degree Fahrenheit and found a consistent value of 778.24 foot pound force (4.1550 J·cal −1). Joule contended that motion and heat were mutually interchangeable and that, in every case, a given ...
calorie: Cal (Calorie) Cal 1.0 Cal (4.2 kJ) megacalorie: Mcal Mcal 1.0 Mcal (4.2 MJ) kilocalorie: kcal kcal 1.0 kcal (4.2 kJ) calorie: cal cal 1.0 cal (4.2 J) millicalorie ...
The calorie is defined as the amount of thermal energy necessary to raise the temperature of one gram of water by 1 Celsius degree, from a temperature of 14.5 °C, at a pressure of 1 atm. For thermochemistry a calorie of 4.184 J is used, but other calories have also been defined, such as the International Steam Table calorie of 4.1868 J .
A nutritional Calorie is equivalent to a thousand chemical or thermodynamic calories (abbreviated "cal" with a lower case "c") or one kilocalorie (kcal). Because food energy is commonly measured in Calories, the energy density of food is commonly called "caloric density". [ 7 ]
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J⋅g −1 ⋅K −1; Human body. The specific heat of a slave is calculated from the measured values of individual tissues is 2.98 kJ · kg−1 · °C−1. This is ...
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