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entropy
The tendency of a system that is left to itself to descend into chaos

The dispersal of energy; how much energy is spread out in a process, or how widely spread out it becomes, at a specific temperature.

For parents, the concept of entropy is easy to understand, because children inevitably increase entropy, while parents struggle to reduce it Entropy is a measure of disorganization, which children create when they spread their Happy Meal toys across a room (and perhaps the best measure of economic progress is whether we give our children these opportunities to create entropy) In the context of IFE, the entropy of deuterium and tritium are much lower for D-T ice than D-T gas at the same temperature The practical result is that D-T gas, when compressed to a high pressure, reaches much higher temperatures than D-T ice, potentially a temperature high enough to initiate a fusion burn Unfortunately, it takes a lot more energy to compress D-T gas to this temperature--thus the desire in IFE to start with most of the D-T fuel as easily-compressed D-T ice
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
(communication theory) a numerical measure of the uncertainty of an outcome; "the signal contained thousands of bits of information"
Entropy is a state of disorder, confusion, and disorganization. a lack of order in a system, including the idea that the lack of order increases over a period of time (entropie, from trepein ). Measure of a system's energy that is unavailable for work, or of the degree of a system's disorder. When heat is added to a system held at constant temperature, the change in entropy is related to the change in energy, the pressure, the temperature, and the change in volume. Its magnitude varies from zero to the total amount of energy in a system. The concept, first proposed in 1850 by the German physicist Rudolf Clausius (1822-1888), is sometimes presented as the second law of thermodynamics, which states that entropy increases during irreversible processes such as spontaneous mixing of hot and cold gases, uncontrolled expansion of a gas into a vacuum, and combustion of fuel. In popular, nontechnical use, entropy is regarded as a measure of the chaos or randomness of a system
1 A measure of the dispersal or degradation of energy 2 A measure of the disorder or randomness in a closed system For example, the entropy of an unburned piece of wood and its surroundings is lower than the entropy of the ashes, burnt remains, and warmed surroundings due to burning the that piece of wood
The entropy is regarded as measured from some standard temperature and pressure
In macroscropic thermodynamic, entropy is simply defined as a state variable whose changes in value are defined by the Second Law and whose absolute value for some matierals can be fixed according to the Third Law However, statistical mechanics provides more insight into the nature of entropy It is a measure of the "disorder" of a system, by which is meant the number of available configurations or microscopic states that are consistent with a given macroscopic or average state This relation, S = k ln , is inscribed on Boltzmann's tombstone
the measure of randomness or disorder of a system; in chemical reactions and molecular processes, spontaneous progress is always made in a direction which will increase the total state of disorder; as an analogy, throwing a bundle of confetti in the air will result in many isolated pieces scattered all over the ground, not the single bundle from which the pieces originated
is a measure of the unavailability of energy in a substance
a measure of the degree of disorder or randomness in a system
A measure of the disorder of a system
Entropy is the measure of the disorder or randomness of energy and matter in a system
The production of heat in every energy change The gradual "winding down" of the universe The amount of disorder and randomness in a system
The randomness, or disorder in a system
The entropy of a system is defined in terms of the number the number of states accessible to it by the relation It provides a logarithmic measure of the degree of randomness of a system
(thermodynamics) a thermodynamic quantity representing the amount of energy in a system that is no longer available for doing mechanical work; "entropy increases as matter and energy in the universe degrade to an ultimate state of inert uniformity"
A measure of the disorder in a system
The degree of randomness or disorder in a system
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