Editing Specific heat capacity (section)

===Calories===
In chemistry, heat amounts were often measured in [[calorie]]s. Confusingly, there are two common units with that name, respectively denoted ''cal'' and ''Cal'': 
* the ''small calorie'' (''gram-calorie, cal'') is 4.184 J exactly. It was originally defined so that the specific heat capacity of liquid water would be 1&nbsp;cal/(°C⋅g). 
*The ''grand calorie'' (''kilocalorie, kilogram-calorie, food calorie, kcal, Cal'') is 1000 small calories, 4184 J exactly. It was defined so that the specific heat capacity of water would be 1&nbsp;Cal/(°C⋅kg).
While these units are still used in some contexts (such as kilogram calorie in [[nutrition]]), their use is now deprecated in technical and scientific fields. When heat is measured in these units, the unit of specific heat capacity is usually: 

{{block indent|1=1&nbsp;{{sfrac|cal|°C⋅g}} = 1&nbsp;{{sfrac|Cal|°C⋅kg}} = 1&nbsp;{{sfrac|kcal|°C⋅kg}}  = 4184&nbsp;{{sfrac|J|kg⋅K}}<ref>°C=K</ref> = 4.184&nbsp;{{sfrac|kJ|kg⋅K}}.}}

Note that while cal is '''{{frac|1|1000}}''' of a Cal or kcal, it is also per ''gram'' instead of '''kilo'''''gram'': ergo, in either unit, the specific heat capacity of water is approximately 1.