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相关概念视频

Heat Flow and Specific Heat01:12

Heat Flow and Specific Heat

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Heat is a type of energy transfer that is caused by a temperature difference, and it can change the temperature of an object. Since heat is a form of energy, its SI unit is the joule (J). Another common unit of energy often used for heat is the calorie (cal), which is defined as the energy needed to change the temperature of 1 g of water by 1 °C, specifically between 14.5 °C and 15.5 °C, since the energy needed shows a slight temperature dependence. Another commonly used unit is...
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Heat Capacities of an Ideal Gas II01:23

Heat Capacities of an Ideal Gas II

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For a system that undergoes a thermodynamic process at a constant volume condition, the heat absorbed is used only to increase the system's internal energy and not for doing any kind of work. While for a system undergoing a thermodynamic process under a constant pressure condition, the amount of heat absorbed is used not only for increasing the internal energy (as a function of temperature) but also for doing some work. The molar heat capacity is the amount of heat required to increase the...
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Heat Capacities of an Ideal Gas I01:14

Heat Capacities of an Ideal Gas I

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Heat capacity is the ratio of heat absorbed by the substance corresponding to its temperature change. It is also called thermal capacity and the SI unit of heat capacity is J/K. Whereas, specific heat capacity is defined as the amount of heat necessary to change the temperature of 1 kg of a substance by 1 K and is also called massic heat capacity. Its SI unit is J/kg⋅K.
Molar heat capacity quantifies the ratio of the amount of heat added (or removed) to increase (or decrease) the...
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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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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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Heat Capacities of an Ideal Gas III01:25

Heat Capacities of an Ideal Gas III

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The number of independent ways a gas molecule can move along straight line, rotate, and vibrate is called its degrees of freedom. Supposing d represents the number of degrees of freedom of an ideal gas, the molar heat capacity at constant volume of an ideal gas in terms of d is
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相关实验视频

Updated: Sep 10, 2025

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

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热扩散不变

Liujun Xu1, Pengfei Zhuang2, Fubao Yang1

  • 1Graduate School of China Academy of Engineering Physics, Beijing 100193, China.

Physical review letters
|August 27, 2025
PubMed
概括

研究人员开发了一种热扩散不变体来对热结构进行分类,从而使热管理和元材料设计中的应用能够精确地设计过渡热元材料.

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科学领域:

  • 物理
  • 材料科学
  • 热力学

背景情况:

  • 在电子,光子和语音系统中对几何特征进行分类时建立了拓不变量.
  • 目前还没有统一的不变量来分类热结构的功能性质.

研究的目的:

  • 为热结构制定一种新的散热不变量.
  • 建立热功能和扩散性之间的相关性.
  • 为了实现先进的热转化材料的设计.

主要方法:

  • 一个热扩散不变的配方.
  • 使用自由形式的短暂热罩进行实验验证.
  • 探索热对流和辐射中的应用.

主要成果:

  • 热扩散不变量明确地将热功能与扩散性相关联.
  • 为各种热元材料建立了一个统一的框架.
  • 这种不变物有助于设计具有同位热导力的自由形过渡热元材料.

结论:

  • 热扩散不变提供了设计热元材料的新范式.
  • 这种不变性适用于热遮蔽,幻觉,对流和辐射.
  • 这些发现为热管理和不平衡传输研究开辟了新的途径.