Thermodynamics? Basic concepts Therme (heat) and dynamis (force), words Greeks who in its junction had given to origin the thermodynamic word, that appeared with the attempt to transform heat into work, being its study the main objective of this science. If arresting only to this concept this science currently it does not approach all the energy forms and its transformation, thus, we can say that the thermodynamics is the science that studies the energy in its diverse forms. The First one I begin of the Thermodynamics establishes that any interaction enters the substances the contained energy in one can changed into any the other more total amount is remained constant, that is, the energy is not created and nor if it only destroys we can transform it, is carrying about one of the basic laws of the nature, also known as law of the Conservation of Energy. As I begin of the Thermodynamics affirms that nor all the transformations where the energy if conserve can occur. Classic thermodynamics is study that approaches the substance in a generalista way if not worrying about the behavior of particles.

Thermodynamic statistics, a more including and complicated boarding, it needs carrying the knowledge the behavior of molecules being based on the behavior of a great one I number of elementary particles. We know that the substance is constituted by a great particle number that is molecule flames, a classic example for the agreement of the two concepts above is the behavior of a constituted reservoir of a gas, the pressure in the interior of the same is resulted of the transference of the amount of movement enters molecules of the gas and the wall of the reservoir at the moment where the first one shocks if with second and if wanting to study the behavior of molecules we have that to apply the thermodynamics statistics, if to want to know only the pressure in the interior of the reservoir we apply the classic thermodynamics, needing only the installation a manometer for knowledge of same, being it of bigger applicability in engineering problems.

The thermodynamics are related with the most diverse areas of engineering, one of main and the application in projects and analyze of engines of internal combustion, turbines of airplanes, thermal central offices, of refrigeration and nuclear, etc. Thermodynamic System ‘ ‘ it is any amount of substance, or region of the space, that if it chooses with the objective to study its comportamento’ ‘. The exterior regions are known as neighborhood. Electron research contributes greatly to this topic. the border of the system, real or imaginary surface that separates the system of the neighborhood, being able to be fixed or mobile, thermodynamic System. Open system: volume of space that allows to exchanges of mass and energy. Closed system: but energy exchanges occur (constant mass). Isolated system: exchanges of mass energy do not occur nor.