What is the engine

Khemanimi, H.(2010, Jan. 29)

What is an Engine?
From
http://www.brighthub.com/engineering/mechanical/articles/1392.aspx
Summary
The article talks about the engine and how it is important for us. Every car and airplane has an engine; if we don’t have an engine we can not travel or go to work and life is going to be hard, we can say the engine changed human life. Everybody should know the definition of the engine, it is a device that convert the chemical energy into a heat energy then into a mechanical energy, but we can't use all the energy and convert it to mechanical energy, so some of this energy is lost. However, we have called efficiency of the engine, it depends on the ratio of the total energy to the total thermal energy,
The engines have two types; the first one called Internal combustion engine (IC) in this type the burning of the fuel happens inside the engine, all the cars use this type of engine and it has two common types petrol engine and Compression Ignition Engines. However the second type is External combustion engine in this type the burning of the fuel occurs outside.

Reaction:
I think that the engine is the most important device in mechanical engineering. We are using the engine every day and everybody needs to use the engine at home or outside the home. It is really good article for people who don’t know the engine very well.


Vocabulary:
Ushered: to lead.
Era: he period of time to which anything belongs or is to be assigned
Achievement: something accomplished, esp. by superior ability, special effort, great courage
Exhaust: the parts of an engine through which the exhaust is ejected
Friction: surface resistance to relative motion, as of a body sliding or rolling.
Broad: main or general
Ignition: a means or device for igniting.