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They are both an measure of chemical energy

However,

Calorie is an old-fashioned Imperial system of enertgy measure

Joules in the modern S.I. system of energy measure.

The converskion factor between them is 1 cal = 4.184 J

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lenpollock

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1y ago

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What is the unit of measurement for heat?

First scientists used calorie as the unit of heat energy. One calorie is the amount of heat required to raise the temperature of one gram of water through one degree celcius. So 1000 cal is taken as kilo calorie. Even now a days we use such units in case of biological energy. Later scientists have found that heat is also a kind of energy which is closely related to mechanical energy as 1 cal = 4.18 joule So k cal requires 4180 joule of energy. This is what we call mechanical equivalent of heat energy. So at present stage we use only joule as the unit of heat energy. Especially in chemistry they use kilojoule/mole etc.


What is the amount of energy required to raise the temperature of one gram of water by one degree celsius?

The small calorie, symbol cal (note the lower case c) is the energy required to raise the temperature of 1 gram of water by 1 degree Celsius at 1 atmosphere of pressure. The small calorie is a pre SI metric unit of energy. In SI terms it is equivalent to about 4.2 Joules of energy. The small calorie is also called the gram calorie. If the subject is physics, calorie refers to the gram calorie, the small calorie.The large Calorie (note the upper case C) is the energy required to raise the temperature of 1 kilogram of water by 1 degree Celsius at one atmosphere of pressure. When the subject is diet, such as food nutritional data, Calorie always means the large Calorie, the kilogram Calorie.The existence of these two different but related units with the same name is confusing and is an invitation to error. This is unfortunate, but the kilo Calorie is deeply embedded in nutritional literature, and the gram Calorie is embedded in early physics literature, so we are stuck with this situation.If you are doing physics, try to stay with SI units.1 joule is needed to raise the temperature of one gram of water by one degree Celcius.


How is the Joule-Thomson effect calculated in thermodynamics?

The Joule-Thomson effect is calculated in thermodynamics by using the Joule-Thomson coefficient, which is the rate of change of temperature with pressure at constant enthalpy. This coefficient is determined by taking the partial derivative of temperature with respect to pressure at constant enthalpy. The formula for the Joule-Thomson coefficient is given by (T/P)H, where is the Joule-Thomson coefficient, T is temperature, P is pressure, and H is enthalpy.


Are copper and silver similar or different?

Copper and silver are both metallic elements, but they have different properties. Copper is reddish-brown in color, while silver is shiny and white. They also have different melting points and densities.


How 1.987 Cal convert into joule?

1 calorie equals 4.18400 joules so multiply 1.987 by 4.184. 1.987 cal equals 8.313608 J.