Differentiate between internal Combustion engine and external combustion engine.

External Combustion Engine	Internal Combustion Engine
1.       Definition: An external combustion engine is a heat engine where a working fluid, contained internally, is heated by combustion in an external source, through the engine wall or a heat exchanger.	1.       Definition: As the name suggests, Combustion of air-fuel mixture takes place inside the Internal Combustion Engine and combustion products drive the shafts as in automotive engine. Similar action takes place in case of Gas Turbines.
2.       Another Definition: In an "external combustion engine" the fuel mixes with an oxidizer and burns outside the engine.	2. Another Definition: In an "internal combustion engine" the fuel mixes with an oxidizer and burns inside the engine
3. Where it Use? Steam piston engines, steam turbines, and rankine cycle fluid to gas devices are types of external combustion engines.	3. Where it use? Gas and diesel vehicle engines, jet turbines, and rocket motors are types of internal combustion engines.
4. External combustion engine run smoothly and silently.	4. Internal combustion engines are very noisy. Noise produce from continuous explosions inside the cylinder of IC engine.
5. Working pressure and temperature in external combustion is low	5. In internal combustion engine working pressure and temperature is high.
6. External combustion engine have 15-20% efficiency.	6. Internal combustion engine have 35-60% efficiency.
7. An external combustion engine requires a boiler and other components to transfer energy.	7. Internal combustion engine requires spark to work.
8. External combustion engine cannot be started instantaneously.	8. Internal combustion engine starting is quick and easy.
9. Combustion of fuel takes place outside the cylinder.	9. In internal combustion fuel takes place inside the cylinder.
10. Weight of external combustion engine is high.	10. Weight of internal combustion engine is low.
11. Cost of external combustion is very high.	11. It is less costly then external combustion engine.
12. Large space is required for external combustion engine.	12. Less space is required for internal combustion engine.