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He steam is the state in which is a gas when it is at a level lower than its critical point; this refers to those conditions of pressure and temperature above which it is impossible to obtain a liquid by compression. If a gas is below that point, this means that it is susceptible to condensation through a reduction in its temperature (keeping the pressure constant) or via pressurization (with constant temperature).

It is important to clarify that a gas It is a substance that meets a well-defined characteristic: having neither its own shape nor volume. This allows it to conform to the shapes of the element that contains it or to disperse if it is not contained. In some special cases, such as steam, said gas can condense to be easily manipulated; However, this is not a characteristic of all gases.

He water vapor is the gas obtained from the boiling (the physical process by which the entire mass of a liquid is converted to the gaseous state) or of the evaporation (the same process, but that can be specified in a temperature indistinctly and without the entire mass of the liquid reaching its boiling point) of the liquid water or of the sublimation (the change from solid to gaseous state) of ice. This vapor has no smell or color.

Steam locomotives

From the Industrial Revolution Many advances have taken place in the life of societies. Among them was the invention of steam as a source of energy for the means of transport; in this way the steam locomotive emerged that allowed the movement thanks to the energy arising from the combustion of components such as coal or fuel oil in a boiler. Thus the water was heated and when it entered the boiling temperature, it generated a certain pressure that moved some pistons that were connected to the wheels; they began to turn and made the carriage or the locomotive move together.

The first steam locomotive was devised by Richard Trevithick in 1804 and managed to move five wagons loaded with steel (10t) and passengers (70 people), at a speed of 8 km / h. He is awarded the creation of this means of transport, which meant an unavoidable leap in the development of societies.
But there are many other names related to the steam locomotive and the advances in the means of transportation, two of them are:

* John Blenkinsop: It was he who designed the serrated rails so that the wheels of the locomotive were fixed and could move safely. This model was used for many years and from it derives the current design of all rails.
* George Stephenson: fuel the one that improved combustion mechanism, creating the first modern steam locomotive that distributed the heat more efficiently. It was called Rocket and its work system was also used in subsequent locomotives.

But finally, when locomotives that combined a diesel and electric system, based on the internal combustion of the engine, appeared in the early 20th century. Petroleum , the steam were slowly falling into disuse.

It should also be mentioned that in the past many vessels were driven by steam engines . These ships had boilers or steam turbines and water cooled condensers that allowed them to move without relying on currents or winds. Thanks to steam, the first transatlantic ships could be created. At present there are no longer any vessels that use this method of propulsion.

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