Chapter 17 Heat and the first law of Thermodynamics 3 Calorie The amount of heat necessary to raise the temperature of 1 gram of water by 1 Celsius degree. 4 Mechanical equivalent of heat In si units, the unit for heat is the joule 1 Calorie=4. 186J Example 17-1 page 405Chapter 17 Heat and the First Law of Thermodynamics The amount of heat necessary to raise the temperature of 1 gram of water by 1 Celsius degree. 3 Calorie 1 Calorie=4.186 J In SI units, the unit for heat is the joule. 4 Mechanical equivalent of heat Example 17-1 page 405