•Calorie
–An historical unit, before the connection between thermodynamics and mechanics was recognized
–A calorie is the amount of energy necessary to raise the temperature of 1 g of water from 14.5° C to 15.5° C .
•A Calorie (food calorie) is 1000
cal
•1 cal = 4.186 J
–This is called the Mechanical Equivalent of Heat