first law of thermodynamics states that the change in internal energy is possible only if external influences.In other words, if the system will be reported and the amount of heat over it will do the work, the activity of the body increase.
first law of thermodynamics, which is the definition of the law of conservation of energy is applied only to systems having macroscopic dimensions.It is the mathematical expression of the first law of science that studies the general properties of systems.This is thermodynamics.
System status can be changed with the help of two completely differing ways.The first relates to the effect on the movement of the surrounding bodies at a distance, which is defined as the macroscopic.It is also possible to work in close proximity to objects on the system.The second way is connected with the transmission or withdrawal of heat energy.In this case, the surrounding body system do not change their location.
first law of thermodynamics states that the initial and final values of heat and work are the characteristics of the process that takes place over the matter under consideration.In that case, the system performs closed loop, returning to its original state, the magnitude of thermal effects will be similar to the work that the body will produce.
first law of thermodynamics leads to the conclusion that there is a concept of internal energy.It is a characteristic of the system state.Probable cases when the internal energy of an isolated body remains unchanged.This heat transfer takes place only between the substances present in the system.Then that value of heat that flows away from the cooling bodies is equal to its number, flowing to the heated bodies.The total internal energy of a closed system in this case is the same.This condition is a thermal balance.
If the system is transferred to a certain amount of energy, the internal activity of the body is taken as a positive value, and the reverse process - as a negative.
first law of thermodynamics, chemistry is also used in their research.It is believed that the internal energy is stored in the kinetic state.Her expression is a movement of ions, atoms and molecules.In addition, the energy of the system is stored in intranuclear forces and chemical bonds.The absolute value of the activity of the substance can not be determined.In this regard, it is set change associated with a particular process.
first law of thermodynamics in chemistry is considering work as extension agents.Its action is directed in opposition to the external atmospheric pressure.A positive value of this work is that the system increases its internal energy.When a negative value is lost.
work, as well as the heat does not apply to the properties of the system.These parameters are used to characterize the interaction of matter with its environment.The work in this case is the quantitative expression of the transfer motion of the molecules are ordered, and the heat - the equivalent of a chaotic movement.This is especially true in chemical reactions.If the process is not yet in its initial stage or already completed, it is impossible to assert that there are in the system of work and heat.During a chemical reaction produced a regrouping of all the atoms.In this regard, some destroyed and others are formed.The result is a change in the internal state of the system and its energy.These changes are the reason for the outflow of heat from the material in its environment.
According to the first law of thermodynamics, the work of any mechanism provided by a certain amount of heat, which must be obtained from outside, either by reducing its internal energy.Thus, the efforts of many inventors who are trying to construct a perpetual motion machine, were doomed to failure.
