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Calorimetry01:19

Calorimetry

3.9K
When objects at different temperatures are placed in contact with each other but isolated from everything else, they attain thermal equilibrium. A container that prevents heat transfer in or out is called a calorimeter, and the use of a calorimeter to make measurements is called calorimetry. Generally, these measurements involve heat or specific heat capacity. The term "calorimetry problem" is used for any problem where the specified objects are thermally isolated from their...
3.9K
Heating and Cooling Curves02:44

Heating and Cooling Curves

25.9K
When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves.
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
25.9K
Specific Heat01:16

Specific Heat

66.6K
The specific heat capacity of a substance refers to the energy required to increase the temperature of one gram of that substance by one degree Celcius. Specific heat capacity is often represented in calories (cal), grams (g), and degrees Celsius (oC), but can also be expressed in joules (J), kilograms (kg), and Kelvin (K), among other units.
For example, increasing the temperature of one gram of water by 1°C requires one calorie of heat energy and can be written as 1 cal/g-°C, or...
66.6K
Heat Flow and Specific Heat01:12

Heat Flow and Specific Heat

6.4K
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...
6.4K
Mechanism of heat transfer01:19

Mechanism of heat transfer

1.7K
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...
1.7K
Mechanisms of Heat Transfer I01:14

Mechanisms of Heat Transfer I

5.5K
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.
5.5K

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相关实验视频

Updated: Nov 30, 2025

Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation
11:11

Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation

Published on: May 2, 2016

11.4K

用于冷却和加热的热量材料

X Moya1, N D Mathur1

  • 1Department of Materials Science, University of Cambridge, Cambridge, UK.

Science (New York, N.Y.)
|November 13, 2020
PubMed
概括

热,包括磁热,电热和机热效应,为高效的冷却和加热提供了有前途的解决方案. 最近的进展将这些技术统一用于应对气候变化.

科学领域:

  • 材料科学
  • 热力学
  • 可持续能源

背景情况:

  • 几十年来,磁热材料已被用于热.
  • 电热和机热材料最近得到了关注.
  • 热量效应为先进的热技术提供了统一的方法.

研究的目的:

  • 突出目前热量效应研究的重要性.
  • 讨论热量材料,测量和原型的最新进展.
  • 强调热在应对气候变化的潜力.

主要方法:

  • 关于热量效应的最新文献的审查.
  • 对材料发现和表征方面的进展进行分析.
  • 检查原型的开发和性能.

主要成果:

  • 热量研究统一了磁热量,电热量和机热量现象.
  • 在开发新的热量材料方面取得了重大进展.
  • 原型展示了高效的冷却和加热应用的潜力.

结论:

  • 卡路里热是一个快速发展的领域,具有巨大的潜力.

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Esophageal Heat Transfer for Patient Temperature Control and Targeted Temperature Management

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相关实验视频

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  • 这一统一的研究领域对于开发可持续能源解决方案至关重要.
  • 进一步开发热量材料和设备对于实际应用至关重要.