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| Water transport are widely used nowadays |
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Release time:2013-11-27 15:37/Source:admin/Reads:/Enquiry
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Nowadays, water and road transport are widely used. Water transport is movement by means of a watercraft—such as a barge, boat, ship or sailboat—over a body of water, such as a sea, ocean, lake, canal or river. At present, water transport is much cheaper than air transport. When the weight and dimension (which is also called CMB) of goods are very large, people can choose water transport if the time is not urgent. During water transport, all the good will in containers, and the containers protect by plastic seals. The need for buoyancy is common to watercraft, making the hull a dominant aspect of its construction, maintenance and appearance.
In the 19th century the first steam ships were developed, at that time, plastic seals had not been used in water transport, using a steam engine to drive a paddle wheel or propeller to move the ship. The steam was produced in a boiler using wood or coal and fed through a steam external combustion engine. Now most ships have an internal combustion engine using a slightly refined type of petroleum called bunker fuel which is more fast. Some ships, such as submarines, use nuclear power to produce the steam. Recreational or educational craft still use wind power, while some smaller craft use internal combustion engines to drive one or more propellers, or in the case of jet boats, an inboard water jet. In shallow draft areas, hovercraft are propelled by large pusher-prop fans.
Although slow, modern sea transport is a highly efficient method of transporting large quantities of goods. Commercial vessels, nearly 35,000 in number, carried 7.4 billion tons of cargo in 2007. Transport by water is significantly less costly than air transport for transcontinental shipping; short sea shipping and ferries remain viable in coastal areas. This also leads to large quantity of plastic seals are used every year.
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