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Saturday, 5 September 2015

Thermodynamics

Thermodynamics


Thermodynamics is the discipline inside the mother science, physics, deals with the study of the relationships established between heat and other forms of energy. Among other issues thermodynamics deals with analyzing the effects of changes in variables such as temperature, density, pressure, mass, volume, systems and macroscopic level.
The basis on which all studies of thermodynamics loom is the circulation of energy and how it is able to infuse movement.

Worth noting that this issue was just promoted the development of this science, because its origin was due to the need to increase the efficiency of the first steam engines.
Then, from the kickoff, thermodynamics, has been busy describing how systems respond to changes in their environment, and can be applied to countless situations, both science and engineering, such as motors, chemical reactions, phase transitions, transport phenomena, black holes, among others. And so their results are really appreciated for physical chemistry and chemical engineering.

Meanwhile, Thermodynamics has three fundamental laws ... the first law is popularly known as the principle of conservation of energy and states that if a system exchanges heat with another, its own internal energy change. In this case, the heat energy will be required to exchange a system to compensate for differences between the internal energy and work.

For its part, the second law proposes various restrictions on transfers of energy, which could be realized if one considers the first law; the second principle speaks of regulating direction in which are carried out thermodynamic processes, imposing the possibility that these are developed in the opposite direction. This second law rests against entropy (physical quantity measuring part of the energy may be used to produce work).

And the third and last law holds that it is impossible to reach a temperature equal to absolute zero through a finite number of physical processes.

And the most important processes that take place in thermodynamics are: isothermal (temperature unchanged), isobaric (pressure unchanged), Isochoric (the volume does not change) and adiabatic (no heat transfer occurs).