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Related Concept Videos

Entropy02:39

Entropy

33.6K
Salt particles that have dissolved in water never spontaneously come back together in solution to reform solid particles. Moreover, a gas that has expanded in a vacuum remains dispersed and never spontaneously reassembles. The unidirectional nature of these phenomena is the result of a thermodynamic state function called entropy (S). Entropy is the measure of the extent to which the energy is dispersed throughout a system, or in other words, it is proportional to the degree of disorder of a...
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Entropy01:18

Entropy

3.2K
The first law of thermodynamics is quantitatively formulated via an equation relating the internal energy of a system, the heat exchanged by it, and the work done on it. A quantitative formulation of the second law of thermodynamics leads to defining a state function, the entropy.
When an ideal gas expands isothermally, the disorder in the gas increases. From the molecular perspective, the gas molecules have more volume to move around in.
Consider an infinitesimal step in the expansion, which...
3.2K
The Uncertainty Principle04:08

The Uncertainty Principle

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Werner Heisenberg considered the limits of how accurately one can measure properties of an electron or other microscopic particles. He determined that there is a fundamental limit to how accurately one can measure both a particle’s position and its momentum simultaneously. The more accurate the measurement of the momentum of a particle is known, the less accurate the position at that time is known and vice versa. This is what is now called the Heisenberg uncertainty principle. He...
30.2K
Third Law of Thermodynamics02:38

Third Law of Thermodynamics

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A pure, perfectly crystalline solid possessing no kinetic energy (that is, at a temperature of absolute zero, 0 K) may be described by a single microstate, as its purity, perfect crystallinity,and complete lack of motion means there is but one possible location for each identical atom or molecule comprising the crystal (W = 1). According to the Boltzmann equation, the entropy of this system is zero.
20.9K
Entropy and the Second Law of Thermodynamics01:20

Entropy and the Second Law of Thermodynamics

3.9K
The second law of thermodynamics can be stated quantitatively using the concept of entropy. Entropy is the measure of disorder of the system.
The relation  between entropy and disorder can be illustrated with the example of the phase change of ice to water. In ice, the molecules are located at specific sites giving a solid state, whereas, in a liquid form, these molecules are much freer to move. The molecular arrangement has therefore become more randomized. Although the change in average...
3.9K
Second Law of Thermodynamics02:49

Second Law of Thermodynamics

26.0K
In the quest to identify a property that may reliably predict the spontaneity of a process, a promising candidate has been identified: entropy. Processes that involve an increase in entropy of the system (ΔS > 0) are very often spontaneous; however, examples to the contrary are plentiful. By expanding consideration of entropy changes to include the surroundings, a significant conclusion regarding the relation between this property and spontaneity may be reached. In thermodynamic models, the...
26.0K

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Related Experiment Video

Updated: Nov 27, 2025

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Entropy in Foundations of Quantum Physics.

Marcin Pawłowski1

  • 1International Centre for Theory of Quantum Technologies, University of Gdańsk, 80-952 Gdańsk, Poland.

Entropy (Basel, Switzerland)
|December 8, 2020
PubMed
Summary

Entropy has diverse applications in quantum physics foundations, utilizing its unique mathematical properties. This study explores various ways entropy informs our understanding of quantum phenomena.

Area of Science:

  • Quantum Physics
  • Foundational Studies
  • Information Theory

Background:

  • Entropy, a fundamental concept in thermodynamics and information theory, is increasingly recognized for its role in quantum mechanics.
  • The abstract highlights the multifaceted nature of entropy's application within the foundational studies of quantum physics.
  • Various properties of entropy as a mathematical object are leveraged to explore quantum phenomena.

Discussion:

  • This research delves into the diverse methodologies employing entropy to probe the core principles of quantum physics.
  • It examines how different facets of entropy's mathematical structure offer unique insights into quantum foundations.
  • The study bridges concepts from information theory and quantum mechanics through the lens of entropy.

Key Insights:

Keywords:
entropyfoundations of quantum mechanicsquantum cryptography

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  • Entropy serves as a versatile tool with multiple applications in understanding the foundations of quantum physics.
  • The specific mathematical properties of entropy are crucial for its utility in quantum foundational studies.
  • Different approaches to entropy reveal distinct aspects of quantum theory.

Outlook:

  • Further exploration into entropy's role could lead to new theoretical frameworks in quantum physics.
  • Investigating novel applications of entropy may deepen our comprehension of quantum information and computation.
  • This work paves the way for interdisciplinary research connecting entropy, quantum foundations, and information theory.