THE ADOPTION OF JOULES AS UNITS OF ENERGY prepared by FAO、第5段落 The "Thermochemical calorie" was defined by Rossini simply as 4.1833 international joules in order to avoid the difficulties associated with uncertainties about the heat capacity of water (it has been redefined as 4.1840 J exactly).
"Does the history of food energy units suggest a solution to "Calorie confusion"?" Hargrove, James L (2007). Nutrition Journal. 6 (44): 44. doi:10.1186/1475-2891-6-44. PMC 2238749. PMID18086303. Abstract "The Calorie (kcal) of present U.S. food labels is similar to the original French definition of 1825. The original published source (now available on the internet) defined the Calorie as the quantity of heat needed to raise the temperature of 1 kg of water from 0 to 1 °C."
pubmed.ncbi.nlm.nih.gov
"Does the history of food energy units suggest a solution to "Calorie confusion"?" Hargrove, James L (2007). Nutrition Journal. 6 (44): 44. doi:10.1186/1475-2891-6-44. PMC 2238749. PMID18086303. Abstract "The Calorie (kcal) of present U.S. food labels is similar to the original French definition of 1825. The original published source (now available on the internet) defined the Calorie as the quantity of heat needed to raise the temperature of 1 kg of water from 0 to 1 °C."
