What is the relationship between a calorie and a joule?
calorie and Calorie . . . "small calorie" and "large calorie" . . . the common
units of energy before the SI system of units was introduced.
"small" calorie . . . "gram" calorie
energy to warm 1 gram of water 1 degree C.
"large" Calorie . . . "kilogram" Calorie, "kilocalorie", the food calorie
energy to warm 1 kilogram of water 1 degree C
1,000 small calories
The two main units of Energy are the Joule and the Calorie. The Joule is normally represented as the KiloJoule (kJ), which is equivelent to 1000 J. The Calorie is represented as Kcal. 2000 Kcal (calories) is given as the Guideline Daily Allowance for most adults. 1 calorie = 4.184 J or equivalently, 1 kcal = 4.184 kJ Google calculator: http://www.google.com/search?q=1+calorie+in+joules&btnG=Search Wiki Joule entry: http://en.wikipedia.org/wiki/Joule Wiki Calorie entry: http://en.wikipedia.org/wiki/Calorie
Why do you suppose scentists use the joule as the unit of measurement of energy insteasd of the calorie?
Calorie is the unit of heat energy in cgs system. One calorie is the heat energy required to raise the temperature of one gram of water through one degree Celsius. But in MKSA system of units, joule is used as the unit of heat energy. One calorie is equal to 4.180 joule. Calorie is usually used in bio chemical changes.
Calorie is the unit of energy in CGS system of unit. Joule is the unit of energy in general in MKS system of units. Now we must get the relation between these two or tables connecting these. 1 cal = 4.18 J 1 K cal = 4180 J Suppose you rub you hands spening an energy of 4.18 J then 1 cal of heat will be produced. ============================================== calorie and Calorie . . . "small…
Energy is defined as the ability to do work. A calorie is a measure of energy. One calorie, which is actually a Kilocalorie, is the amount of energy required to increase the temperature 1 gram of water by one degree Celsius. Another Answer A calorie is an obsolete metric (cgsA-system) unit for measuring energy. The modern SI unit is the joule. The calorie (or, more accurately, kilocalorie -1000 calories) is widely-used in North America for…