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Related Concept Videos

Mechanism of heat transfer01:19

Mechanism of heat transfer

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...
Thermal Insulation in Masonry Walls01:22

Thermal Insulation in Masonry Walls

In hot, dry climates, the thermal mass of masonry walls can be beneficial, absorbing heat during the day and releasing it at night, thereby stabilizing indoor temperatures. However, in most other climates, additional insulation is necessary to enhance thermal resistance.
External insulation can be applied using an Exterior Insulation and Finish System (EIFS), which involves affixing panels of plastic foam to the wall and covering them with a polymeric stucco reinforced with glass fiber mesh.
Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

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...
Conduction, Convection and Radiation: Problem Solving01:20

Conduction, Convection and Radiation: Problem Solving

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...
Mechanisms of Heat Transfer I01:14

Mechanisms of Heat Transfer I

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.
Mechanisms of Heat Transfer01:14

Mechanisms of Heat Transfer

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 heat.

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Related Experiment Video

Updated: Jul 12, 2026

Comparative Study of Simulation of Temperature Rise in Ring Main Unit
04:35

Comparative Study of Simulation of Temperature Rise in Ring Main Unit

Published on: July 5, 2024

Extraordinary heat insulation in RbAg4I5.

Ziyue Liu1, Qingyu Bai1, Zhiwei Chen1

  • 1Interdisciplinary Materials Research Center, School of Materials Science and Engineering, Tongji University, Shanghai 201804, China.

National Science Review
|July 10, 2026
PubMed
Summary
This summary is machine-generated.

Superionic conductors offer a novel approach to thermal insulation. A porous form of RbAg4I5 achieves record-low thermal conductivity, outperforming traditional insulators and enhancing electronic device performance.

Keywords:
porous heat insulatorsuperionic conductorthermal conductivitythermoelectric device

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Production and Testing of Moisture Behavior and Thermal Properties of Rapeseed Straw and Ganoderma resinaceum Mycelium Bio-Composites
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Production and Testing of Moisture Behavior and Thermal Properties of Rapeseed Straw and Ganoderma resinaceum Mycelium Bio-Composites

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Last Updated: Jul 12, 2026

Comparative Study of Simulation of Temperature Rise in Ring Main Unit
04:35

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Published on: July 5, 2024

Production and Testing of Moisture Behavior and Thermal Properties of Rapeseed Straw and Ganoderma resinaceum Mycelium Bio-Composites
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Production and Testing of Moisture Behavior and Thermal Properties of Rapeseed Straw and Ganoderma resinaceum Mycelium Bio-Composites

Published on: September 5, 2025

Area of Science:

  • Materials Science
  • Solid-State Physics
  • Nanotechnology

Background:

  • Superionic conductors possess unique crystal structures with mobile ions, beneficial for thermal insulation.
  • Conventional insulators like SiO2 lack these crystallographic features, limiting their thermal insulation performance.
  • Existing porous thermal insulators struggle to achieve sufficiently low thermal conductivity.

Purpose of the Study:

  • To explore superionic conductors as a new class of materials for high-performance thermal insulation.
  • To investigate the thermal insulation properties of RbAg4I5, both in single-crystalline and porous forms.
  • To demonstrate the application of these materials in improving thermoelectric devices and electronic component thermal management.

Main Methods:

  • Synthesis and characterization of single-crystalline and porous RbAg4I5.
  • Measurement of room-temperature thermal conductivity (κ) for various forms of RbAg4I5.
  • Integration of porous RbAg4I5 into a Bi2Te3 thermoelectric device.
  • Testing the thermal isolation capabilities of porous RbAg4I5 between a CPU and flash memory.

Main Results:

  • Single-crystalline RbAg4I5 exhibited a low κ of 130 mW m⁻¹ K⁻¹ at room temperature.
  • A 3.6%-dense porous RbAg4I5 achieved a record-low κ of 6 mW m⁻¹ K⁻¹, surpassing existing porous insulators.
  • Incorporation into a thermoelectric device improved performance by 10%.
  • Application near a CPU resulted in a 5.3 K temperature drop for adjacent flash memory, improving startup speed by 16%.

Conclusions:

  • Superionic conductors represent a promising new paradigm for advanced thermal insulation.
  • Porous RbAg4I5 offers exceptional thermal insulation properties, outperforming conventional materials.
  • This material design strategy can significantly advance thermal management in electronic devices and energy conversion systems.