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Related Concept Videos

Heat Engines01:10

Heat Engines

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A heat engine is a device used to extract heat from a source and then convert it into mechanical work used for various applications. For example, a steam engine on an old-style train can produce the work needed for driving the train.
Whenever we consider heat engines (and associated devices such as refrigerators and heat pumps), we do not use the standard sign convention for heat and work. For convenience, we assume that the symbols Qh, Qc, and W represent only the amounts of heat transferred...
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The Carnot Cycle01:30

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Converting work to heat is an irreversible process, and the purpose of a heat engine is to reverse the effect partially. Heat engines aim to increase the efficiency of the reversal, that is, maximize the work retrieved from heat. If the efficiency of a heat engine were 100%, it would imply reversing the process completely without introducing any other effect. Thus, it would violate the second law of thermodynamics.
What could be the theoretical limit to the efficiency of a heat engine? The...
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Mechanisms of Heat Transfer II01:20

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In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
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Mechanisms of Heat Transfer I01:14

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Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
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Mechanisms of Heat Transfer01:14

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Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...
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Mechanism of heat transfer01:19

Mechanism of heat transfer

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Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
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Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation
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Extreme-Temperature Single-Particle Heat Engine.

M Message1, F Cerisola2, J D Pritchett1

  • 1King's College London, Department of Physics, Strand, London WC2R 2LS, United Kingdom.

Physical Review Letters
|December 5, 2025
PubMed
Summary
This summary is machine-generated.

Scientists created a novel engine operating at extreme temperatures exceeding ten Megakelvin. This engine demonstrates giant fluctuations and unique efficiency events, offering insights into fundamental thermodynamic processes.

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Area of Science:

  • Thermodynamics
  • Statistical Physics
  • Microscale Engineering

Background:

  • Studying exotic thermodynamic processes in nature is challenging.
  • Extreme conditions are crucial for understanding fundamental physical limits.

Purpose of the Study:

  • To create a controllable environment for exploring extreme thermodynamics.
  • To investigate the behavior of a microscale engine under extreme temperatures.

Main Methods:

  • Synthesized a structured environment using electrical levitation of a charged microparticle in vacuum.
  • Operated an underdamped engine at temperatures above ten Megakelvin.
  • Theoretically modeled the effects of multiplicative noise on particle diffusion.

Main Results:

  • Observed giant fluctuations in heat exchange.
  • Documented stochastic efficiency events where work output exceeded heat input.
  • Demonstrated position-dependent diffusion due to environmental nonuniformity.

Conclusions:

  • The synthetic environment effectively enables the study of extreme thermodynamic processes.
  • The engine exhibits unique behaviors, including efficiency anomalies and position-dependent diffusion.
  • Theoretical models accurately predict the observed phenomena, validating the experimental setup.