Conduction: In heat, energy transfer from particle to particle within certain materials, or from one material to another when the two are in direct contact.
Convection: A means of heat transfer by movement of the heated substance itself such as by currents in a fluid.
Radiation: Energy transmitted by electromagnetic waves. The particles given off by radioactive atoms such as uranium.
Joules: The SI unit of work and of all other forms of energy. One joule of work is done when a force of one newton is exerted on an object moved one meter in a direction of the force.
Calorie: A unit of heat. One calorie is the heat reqired to raise the temperature of one gram of water one Celsius degree. One calorie is equal to one thousand