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Related Concept Videos

Mechanisms of Heat Transfer I01:14

Mechanisms of Heat Transfer I

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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 Transfer II01:20

Mechanisms of Heat Transfer II

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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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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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Mechanisms of Heat Transfer01:14

Mechanisms of Heat Transfer

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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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Atomic Spectroscopy: Effects of Temperature01:27

Atomic Spectroscopy: Effects of Temperature

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Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature...
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Conduction, Convection and Radiation: Problem Solving01:20

Conduction, Convection and Radiation: Problem Solving

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There are three methods by which heat transfer can take place: conduction, convection, and radiation. Each method has unique and interesting characteristics, but all three have two things in common: they transfer heat solely because of a temperature difference; and the greater the temperature difference, the faster the heat transfer.
In order to solve a problem related to heat transfer, first of all, the situation needs to be examined to determine the type of heat transfer involved. This could...
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Updated: Mar 7, 2026

Characterization of Thermal Transport in One-dimensional Solid Materials
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Characterization of Thermal Transport in One-dimensional Solid Materials

Published on: January 26, 2014

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Heat transport through atomic contacts.

Nico Mosso1, Ute Drechsler1, Fabian Menges1

  • 1IBM Research - Zurich, Säumerstrasse 4, 8803 Rüschlikon, Switzerland.

Nature Nanotechnology
|February 7, 2017
PubMed
Summary
This summary is machine-generated.

Researchers measured heat transport in single-atom gold contacts, confirming the Wiedemann-Franz law at the atomic scale. This finding is crucial for advancing nanoscale electronics and understanding quantum transport phenomena.

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Area of Science:

  • Condensed Matter Physics
  • Nanotechnology
  • Materials Science

Background:

  • Nanoscale heat transport is a critical bottleneck for high-performance electronics.
  • Atomic junctions are ideal model systems for studying quantum transport phenomena.
  • Heat transport in atomic junctions is less understood than charge transport due to experimental challenges.

Purpose of the Study:

  • To experimentally measure heat transfer through atomic junctions.
  • To analyze the thermal conductance of single-atom gold contacts at room temperature.
  • To investigate the relationship between electrical and thermal conductance at the atomic scale.

Main Methods:

  • Fabrication of metallic atomic junctions using gold.
  • Simultaneous measurement of electrical and thermal transport.
  • High-sensitivity detection of small heat fluxes.

Main Results:

  • Demonstrated proportionality between electrical and thermal conductance in atomic junctions.
  • Observed quantization of both electrical and thermal conductance, consistent with conductance quanta.
  • Verified the Wiedemann-Franz law at the single-atom level.

Conclusions:

  • The Wiedemann-Franz law holds true at the atomic scale for metallic contacts.
  • Understanding atomic-scale heat transport is essential for future nanoscale electronic devices.
  • This work provides a foundation for controlling heat flow in quantum electronic systems.