The results of combustion calorimetric
tests of fuels for steam power plants may be expressed in terms
of the 1956 International Steam Table calorie (I.T. cal) which
is defined by the relation, 1 I.T. cal = 4.1868 J. The Btu used
in modern steam tables is defined by the means of the relation,
1 I.T. cal / g = 1.8 I.T. Btu / lb. Thus, 1 I.T. Btu / lb = 2.326 J
/ g.