lotnictwo: Steam engine

Evidence: 100 • authority: 72

A steam engine is a heat engine that performs mechanical work using steam as its working fluid. The steam engine uses the force produced by steam pressure to push a piston back and forth inside a cylinder. This pushing force can be transformed by a connecting rod and crank into rotational force for work. The term "steam engine" is normally applied to reciprocating engines, although some authorities have also referred to the steam turbine and devices such as Hero's aeolipile as "steam engines". The essential feature of steam engines is that they are external combustion engines, where the working fluid is separated from the combustion products. The ideal thermodynamic cycle used to analyze th…

Evidence: 63 • authority: 72

The first recorded rudimentary steam engine was the aeolipile, mentioned by Vitruvius between 30 and 15 BCE and described by Heron of Alexandria in 1st-century Roman Egypt. Several steam-powered devices were later experimented with or proposed, such as Taqi al-Din's steam jack, a steam turbine in 16th-century Ottoman Egypt, Denis Papin's working model of the steam digester in 1679 and Thomas Savery's steam pump in 1698. In 1712, Thomas Newcomen's atmospheric engine became the first commercially successful engine using the principle of the reciprocating piston and cylinder, which was the fundamental type of steam engine used until the early 20th century. The steam engine was used to pump wat…

Evidence: 30 • authority: 88

Evidence: 30 • authority: 72

A machine is a thermodynamic system that uses power to apply forces and control movement to perform an action. The term is commonly applied to artificial devices, such as those employing engines or motors, but also to natural biological macromolecules, such as molecular machines. Machines can be driven by animals and human power, by natural forces such as wind and water, and by chemical, thermal, or electrical power, and include a system of mechanisms that shape the actuator input to achieve a specific application of output forces and movement. They can also include computers and sensors that monitor performance and plan movement, often called mechanical systems. Renaissance natural philoso…

Evidence: 22 • authority: 92

Evidence: 22 • authority: 72

Evidence: 22 • authority: 72