The importance of avoiding irreversible processes (hence reducing the entropy production) was recognized as early as 1824 by Carnot. Originally defined in thermodynamics in terms of heat and temperature, entropy indicates the degree to which a given quantity of thermal energy is available for. If the process takes place over a range of temperature, the quantity can be evaluated by adding bits of entropies at various temperatures. Thus, entropy has the units of energy unit per Kelvin, J K -1. Because work is obtained from ordered molecular motion, the amount of entropy is also a measure of the molecular disorder, or randomness, of a system. Entropy is the amount of energy transferred divided by the temperature at which the process takes place. B as bulk modulus has a unit of (Pa Nm-2).

Development of entropy in a thermodynamic systemĮntropy production (or generation) is the amount of entropy which is produced during heat process to evaluate the efficiency of the process.Įntropy is produced in irreversible processes. entropy, the measure of a system’s thermal energy per unit temperature that is unavailable for doing useful work. The equation of entropy that is shown by equation (85) is already consistent in unit.

Unit of entropy