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Small calorie (cal) is the energy needed to increase 1 gram of water by 1°C at a pressure of 1 atmosphere.
Large calorie (Cal) is the energy needed to increase 1 kg of water by 1°C at a pressure of 1 atmosphere.
Large calorie is also called food calorie and is used as a unit of food energy.
1 calth = 4.184 J
The energy in thermochemical calories E(calth) is equal to the energy in joulesE(J) divided by 4.184:
E(cal) = E(J) / 4.184
1 cal15 = 4.1855 J
The energy in 15°C calories E(cal15)is equal to the energy in joules E(J) divided by 4.1855:
E(cal15) =E(J) / 4.1855