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A car
is something that moves us from one place to another. It has an
engine, 3 or 4 wheels and a steering wheel. Some have many wheels:
big trucks that carry heavy things have up to 18 wheels.
Cars come in many shapes and sizes. They usually have a seat for
the driver and at least one passenger, but some are also able to
carry many passengers, like buses and family station wagons, which
carry from 8 to 60 people. The car is the most common way of getting
around in many countries, but poor countries normally use public
transport, such as buses and taxis.
In order for a car to move, it must be filled with a fuel, most
often gasoline, which is also called petrol. Some other cars must
be filled with diesel fuel; others use natural gas or electricity.
In order for a person to drive a car legally they must have a valid
drivers license. Usually people who are over 18 can apply for one,
but they have to pass certain tests first.
In recent years new lightweight ideas
for cars have been developed to make up for the weight increase
due to comfort and safety issues. Aspects of material selection
and innovative concepts of car construction using light weight materials
help to meet economical and environmental requirements as well as
demands for enhanced driving comfort.
New alloys have been developed for the increasing demands in higher
strength and better formability for light weighting and crash worthiness
aspects. The specific advances of aluminium products as castings,
extrusions and sheet are typical examples for successful solutions
in the most advanced and competitive technolgy market. Natural
gas is a mixture. It consists mainly of hydrocarbons. The main component
is methane. Natural gas is often found in the ground together with
petroleum.
Most natural gas is burnt directly to produce energy.
It burns with a clean blue flame. It causes little pollution.The
main use of natural gas is to produce electricity. It is also used
as fuel for cars, cooking gas and to make fertilizers. |
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