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Related Concept Videos

Entropy and the Second Law of Thermodynamics01:20

Entropy and the Second Law of Thermodynamics

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The second law of thermodynamics can be stated quantitatively using the concept of entropy. Entropy is the measure of disorder of the system.
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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.
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Distribution of Molecular Speeds01:27

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The motion of molecules in a gas is random in magnitude and direction for individual molecules, but a gas of many molecules has a predictable distribution of molecular speeds. This predictable distribution of molecular speeds is known as the Maxwell-Boltzmann distribution. The distribution of molecular speeds in liquids is comparable to that of gases but not identical and can help to understand the phenomenon of the boiling and vapor pressure of a liquid. Consider that a molecule requires a...
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The Second Law of Thermodynamics states that entropy, or the amount of disorder in a system, increases each time energy is transferred or transformed. Each energy transfer results in a certain amount of energy that is lost—usually in the form of heat—that increases the disorder of the surroundings. This can also be demonstrated in a classic food web. Herbivores harvest chemical energy from plants and release heat and carbon dioxide into the environment. Carnivores harvest the...
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Experimentally, if object A is in equilibrium with object B, and object B is in equilibrium with object C, then object A is in equilibrium with object C. That statement of transitivity is called the "zeroth law of thermodynamics." For example, a cold metal block and a hot metal block are both placed on a metal plate at room temperature. Eventually, the cold block and the plate will be in thermal equilibrium. In addition, the hot block and the plate will be in thermal equilibrium.
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The kinetic molecular theory qualitatively explains the behaviors described by the various gas laws. The postulates of this theory may be applied in a more quantitative fashion to derive these individual laws.
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Updated: Jun 27, 2025

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
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Quantumness speeds up quantum thermodynamics processes.

Ming-Xing Luo1,2

  • 1School of Information Science and Technology, Southwest Jiaotong University, Chengdu 610031, China.

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|May 1, 2024
PubMed
Summary
This summary is machine-generated.

We introduce a new quantum thermodynamics speed to quantify work extraction. Quantum coherence and entanglement can significantly accelerate this process, offering new methods for energy harvesting and detecting entangled states.

Keywords:
PhysicsQuantum physicsQuantum theory

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Area of Science:

  • Quantum Thermodynamics
  • Quantum Information Theory
  • Statistical Mechanics

Background:

  • Quantum thermodynamic processes leverage quantum states for efficient energy extraction and computation.
  • Quantifying the impact of quantum coherence and entanglement on work extraction remains a challenge.
  • Existing methods lack a general approach to measure these quantum effects.

Purpose of the Study:

  • To develop a novel method for quantifying work extraction in quantum systems.
  • To theoretically assess the role of quantum coherence in accelerating work extraction.
  • To investigate the potential of genuine quantum entanglement to enhance work extraction efficiency.

Main Methods:

  • Proposal of a new 'thermodynamics speed' metric.
  • Analysis of work extraction in cyclic quantum evolutions.
  • Comparison of work extraction rates for coherent/incoherent and entangled/separable states.

Main Results:

  • Quantum coherence can accelerate work extraction beyond incoherent states.
  • Genuine entanglement offers a speedup in work extraction compared to bi-separable states.
  • The proposed metric provides a physical quantity to identify entangled systems.

Conclusions:

  • The developed thermodynamics speed offers a new tool for quantum thermodynamics research.
  • Quantum coherence and entanglement are identified as key resources for efficient work extraction.
  • This work provides a pathway for experimentally detecting entanglement using thermodynamic measurements.