NCIt definition : A non-SI unit of energy defined as the amount of heat required to raise the temperature
of one kilogram of pure water by one degree Centigrade under standard conditions (the
specific heat of the water at 15 degrees Celsius and the constant pressure of 101.325
kPa or one atm being defined as unity), equal to approximately 4.1855 kJ. It is also
is used by nutritionists in measuring the energy-producing potential of food as a
unit of potential energy contained by a substance, which can be liberated when the
material is oxidized, usually by combustion in the presence of oxygen. According to
the current national standard in the United States (IEEE/ASTM SI 10 TM-2002. American
National Standard for Use of the International System of Units (SI): The Modern Metric
System, New York: IEEE, 2002) the calorie in any form is not to be used. Joules should
be used instead.;
Alternative definition : CDISC: A unit of energy defined as the amount of heat required to raise the temperature
of one kilogram of pure water by one degree Centigrade under standard conditions (the
specific heat of the water at 15 degrees Celsius and the constant pressure of 101.325
kilopascals or one atm being defined as unity), equal to approximately 4.1855 kJ.
It is also is used by nutritionists in measuring the energy-producing potential of
food as a unit of potential energy contained by a substance, which can be liberated
when the material is oxidized, usually by combustion in the presence of oxygen.(NCI); CRCH: The amount of energy needed to increase the temperature of 1 kilogram of water
by 1 degree Celsius. 1 Kilocalorie 4.185 kJ.;