Vapor is the state in which a is a gas when it is at a level below its critical point; This refers to the pressure and temperature conditions above which it is impossible to obtain a liquid by compression. If a gas is below this point, it means that it is susceptible to condensation by reducing its temperature (keeping the pressure constant) or by pressurizing it (with constant temperature).
It is important to clarify that a gas is a substance that meets a well-defined characteristic: it does not have its own shape or volume. This allows it to adapt to the shapes of the containing element or scatter if no content is found. In some special cases, like steam, this gas can be condensed for easy handling; however, this is not a characteristic that all gases possess.
Steam is the gas obtained from boiling (the physical process by which the entire mass of the liquid is converted to a gaseous state) or from evaporation (the same process, but which can be carried out at an indistinct temperature and without the entire mass of the liquid reaching boiling point) of liquid water or sublimation (change from solid to gaseous state) of ice. This vapor is odorless and colorless. Steam locomotives Since 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 means of transport; Thus came the steam locomotive that allowed movement thanks to the energy from the combustion of components such as coal or fuel oil in a boiler. So the water was heated and when it reached the boiling temperature, it generated a certain pressure that moved the pistons that were connected to the wheels; these began to turn and made the carriage or locomotive move rhythmically. The first steam locomotive was conceived 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 credited with creating this means of transport, which meant an inevitable leap in the development of societies.
But there are many other names related to the steam locomotive and the advances in means of transport, two of them are: * John Blenkinsop – It was he who designed the toothed rails so that the locomotive’s wheels were fixed and could move safely. This model has been used for many years and the current design of all rails derives from it.
*George Stephenson: it was he who improved the combustion engine, creating the first modern steam locomotive that distributed heat more efficiently. It received the name of Rocket and its system of work was also used in later locomotives.
But finally, when locomotives that combined diesel and electric systems, based on the internal combustion of oil, appeared at the beginning of the 20th century, steam locomotives gradually fell into disuse. It is also worth mentioning that in the past many boats were powered by steam engines. These ships had steam boilers or turbines and cooled water condensers that allowed them to move without depending on currents or winds. Thanks to steam, the first transatlantic ships were created. Currently, there are no more boats that use this method of propulsion.