![]() Or more simply, if the temperature is kept constant in the process 1 → 2 ( isothermal process): Physical entropy, in its classical form, is defined by the equation proposed by Rudolf Clausius: ![]() ![]() In physics, entropy is the thermodynamic magnitude that allows calculating the part of heat energy that cannot be used to produce work if the process is reversible. The enthalpy of formation is the amount of energy required to form these compositions. Usually, in these tables, the enthalpies of formation of the chemical elements in their standard states set to zero are also expressed. These values are expressed in an entropy table usually indicated at a temperature of 298 K. The standard entropy of a chemical compound is its entropy under the thermodynamic state of 1 atm of pressure. We define this SI unit as the change in entropy experienced by a system when it absorbs the thermal energy of 1 Joule (unit) at a temperature of 1 Kelvin. The units of entropy in the International System are the joules/kelvin (J/K) or Clausius. In the none reversible process, part of the energy turns into entropy because of the conservation of energy. The concept of entropy describes how irreversible a thermodynamic system is. The value of this physical magnitude, in a closed system, is the measure of disorder that a process generates naturally. ![]() The entropy of a system is an extensive state function. In reversible processes, the entropy change is zero. In any irreversible process, the system's disorder increases, and therefore the entropy increases. Consequently, the entropy, that is, the increase in entropy, therefore, the positive variation of this magnitude indicates the natural sense in which an event occurs in an isolated system.Įntropy (S) is a thermodynamic magnitude initially defined as a criterion to predict the evolution of thermodynamic systems. In general, the total entropy of the universe tends to increase. Entropy in physics and chemistry is the magnitude that indicates the energy that cannot perform practical work in a thermodynamic process. ![]()
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