Bk+1+6.4


 * IV. Uses of Heat**
 * A. Heat engine - conversion of thermal energy to mechanical energy uses this device**
 * 1) **make use of combustion**
 * 2) **Combustion - process of burning fuel**
 * 3) **Chemical energy too thermal energy**
 * B. External Combustion engine - the fuel is burned outside the engine**
 * 1) **Steam engine**
 * C. Internal combustion engine - the fuel is burned in cylinders inside the engine**
 * 1) **diesel and gas engines**
 * 2) **stroke - each up or down movement by a piston**
 * D. Refrigerators - transfer thermal energy from the cold space inside to the warm space outside**
 * Quiz 6.4**
 * 1) **Internal combustion Engine:**
 * **fuel is burned inside the engine**
 * **ex. diesel and gas engines**
 * Both**
 * Contains pistons and cylinders**
 * thermal energy is transformed into mechanical energy**
 * External Combustion Engines**
 * steam engine**
 * fuel is burned outside the engine**
 * 2. heat energy-a device that transforms thermal energy to mechanical energy**
 * 3. combustion-the process of burning fuel such as wood or oil**
 * 4. ext. Com engine-a heat engine in which fuel is burned outside the engine**
 * 5. int. Com engine-a heat engine in which fuel is burned inside the engine**
 * 6. refrigerator-a substance that absorbs and releases heat in a refrigerator**
 * Study Guide**
 * 10. refrigerator**