![]() The design from which a water vehicle is created usually seeks to achieve a balance between internal capacity ( tonnage), speed and seaworthiness. Such a vessel may be used in saltwater and freshwater for pleasure, recreation, physical exercise, commerce, transport or military missions. The term "watercraft" (unlike such terms as aircraft or spacecraft) is rarely used to describe any individual object: rather the term serves to unify the category that ranges from jet skis to aircraft carriers. In this context, a passenger ship's "cargo" is its passengers. A merchant ship is any floating craft that transports cargo for the purpose of earning revenue.Traditionally, submarines were called "boats", perhaps reflecting their cramped conditions: small size reduces the need for power, and thus the need to surface or snorkel for a supply of the air that running marine diesel engines requires whereas, in contrast, nuclear-powered submarines' reactors supply power without consuming air, and such craft are large, much roomier, and classed as ships in some navies. ![]() Local law and regulation may define the exact size (or the number of masts) that distinguishes a ship from a boat.A rule of thumb says "a boat can fit on a ship, but a ship can't fit on a boat", and a ship usually has sufficient size to carry its own boats, such as lifeboats, dinghies, or runabouts. ![]()
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