A steamboat or steamship, sometimes called a steamer, is a
ship in which the primary method of propulsion is
steam power, typically driving a
propeller or
paddlewheel. The term steamboat is usually used to refer to smaller steam-powered boats working on lakes and rivers, particularly
riverboats; steamship generally refers to steam powered
ships capable of carrying a (ship's) boat. The term steamwheeler is archaic and rarely used. Steamships gradually replaced sailing ships for commercial shipping through the
19th century, and they were in turn superseded by diesel-driven ships in the second half of the twentieth century. Most
warships used steam propulsion until the advent of the
gas turbine. Today,
nuclear powered warships and
submarines use steam to drive turbines, but are not referred to as steamships or steamboats.
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