Enthalpy vs. Entropy

Enthalpynoun

In thermodynamics, a measure of the heat content of a chemical or physical system.

Enthalpynoun

(thermodynamics) a thermodynamic quantity equal to the internal energy of a system plus the product of its volume and pressure;

Enthalpy

Enthalpy (listen) is a property of a thermodynamic system, and is defined as the sum of the system's internal energy and the product of its pressure and volume. It is a state function used in many measurements in chemical, biological, and physical systems at a constant pressure, that is conveniently provided by the large ambient atmosphere.

Entropynoun

strictly thermodynamic entropy. A measure of the amount of energy in a physical system that cannot be used to do work.

Entropynoun

A measure of the disorder present in a system.

Entropynoun

The capacity factor for thermal energy that is hidden with respect to temperature [http://arxiv.org/pdf/physics/0004055].

Entropynoun

The dispersal of energy; how much energy is spread out in a process, or how widely spread out it becomes, at a specific temperature. [https://web.archive.org/web/20060702234316/http://www.entropysite.com/students_approach.html]

Entropynoun

A measure of the amount of information and noise present in a signal.

Entropynoun

(uncountable) The tendency of a system that is left to itself to descend into chaos.

Entropynoun

A certain property of a body, expressed as a measurable quantity, such that when there is no communication of heat the quantity remains constant, but when heat enters or leaves the body the quantity increases or diminishes. If a small amount, h, of heat enters the body when its temperature is t in the thermodynamic scale the entropy of the body is increased by h ÷ t. The entropy is regarded as measured from some standard temperature and pressure. Sometimes called the thermodynamic function.

Entropynoun

(communication theory) a numerical measure of the uncertainty of an outcome;

Entropynoun

(thermodynamics) a thermodynamic quantity representing the amount of energy in a system that is no longer available for doing mechanical work;

Entropy

Entropy is a scientific concept, as well as a measurable physical property that is most commonly associated with a state of disorder, randomness, or uncertainty. The term and the concept are used in diverse fields, from classical thermodynamics, where it was first recognized, to the microscopic description of nature in statistical physics, and to the principles of information theory.