mechanical equivalent of heat

简明释义

热功当量

英英释义

例句

1.In physics classes, students often learn about the mechanical equivalent of heat 热的机械当量 to understand energy conversion.

在物理课上，学生们通常学习关于热的机械当量 mechanical equivalent of heat 的知识，以理解能量转换。

2.James Prescott Joule's experiments demonstrated the mechanical equivalent of heat 热的机械当量 by converting mechanical work into thermal energy.

詹姆斯·普雷斯科特·焦耳的实验通过将机械功转换为热能，证明了热的机械当量 mechanical equivalent of heat。

3.The formula for calculating the mechanical equivalent of heat 热的机械当量 is essential for students in engineering programs.

计算热的机械当量 mechanical equivalent of heat 的公式对于工程专业的学生来说是必不可少的。

4.Understanding the mechanical equivalent of heat 热的机械当量 helps in designing more efficient engines.

理解热的机械当量 mechanical equivalent of heat 有助于设计更高效的发动机。

5.The concept of mechanical equivalent of heat 热的机械当量 is crucial for engineers working on thermodynamics.

对于从事热力学工作的工程师来说，热的机械当量 mechanical equivalent of heat 的概念至关重要。

作文

The concept of mechanical equivalent of heat is a fundamental principle in the field of thermodynamics and physics. It refers to the relationship between mechanical work and heat, illustrating how energy can be converted from one form to another. This principle was first formulated by James Prescott Joule in the 19th century, who conducted experiments to demonstrate that mechanical energy could produce heat. His findings laid the groundwork for the First Law of Thermodynamics, which states that energy cannot be created or destroyed, only transformed from one form to another.To understand the significance of mechanical equivalent of heat, we must delve into the experiments that Joule performed. One of his most famous experiments involved a paddle wheel submerged in water. By turning the paddle wheel, he was able to do mechanical work on the water, which resulted in an increase in its temperature. This observation led him to quantify the amount of mechanical work required to produce a specific amount of heat, ultimately leading to the formulation of the mechanical equivalent of heat.Joule's work not only demonstrated the interchangeability of mechanical energy and heat but also provided a numerical value for this conversion. He found that approximately 4.184 joules of mechanical energy are needed to raise the temperature of one gram of water by one degree Celsius. This relationship is crucial in understanding energy conservation and efficiency in various systems, from engines to refrigerators.In practical applications, the concept of mechanical equivalent of heat plays a vital role in engineering and technology. For instance, in thermal power plants, the conversion of mechanical energy into electrical energy involves understanding how heat generated from fuel combustion can be harnessed efficiently. Engineers must consider the mechanical equivalent of heat when designing systems to maximize energy output while minimizing waste.Moreover, the principle has implications beyond just mechanical systems. In biological systems, organisms convert food (chemical energy) into heat and mechanical energy to sustain life. The metabolic processes in our bodies exemplify the mechanical equivalent of heat as we perform physical activities and maintain body temperature.In conclusion, the mechanical equivalent of heat is an essential concept that bridges the gap between different forms of energy. Understanding this principle not only enhances our comprehension of physical laws but also informs practical applications in various fields. As we continue to explore energy transformation, the legacy of Joule's work remains a cornerstone of scientific inquiry and technological advancement. The ability to convert and utilize energy efficiently is more critical than ever in our quest for sustainable solutions to global challenges such as climate change and energy scarcity.

“机械等价热”这一概念是热力学和物理学领域的一个基本原理。它指的是机械功与热之间的关系，说明了能量如何从一种形式转化为另一种形式。这个原理最早由詹姆斯·普雷斯科特·焦耳在19世纪提出，他通过实验证明了机械能能够产生热量。他的发现为热力学第一定律奠定了基础，该定律指出能量不能被创造或毁灭，只能从一种形式转变为另一种形式。要理解“机械等价热”的重要性，我们必须深入研究焦耳所进行的实验。他最著名的实验之一涉及一个浸没在水中的桨轮。通过转动桨轮，他能够对水做机械功，从而导致其温度升高。这一观察使他能够量化产生特定数量热所需的机械功，最终形成了“机械等价热”的概念。焦耳的工作不仅展示了机械能与热之间的可互换性，还为这种转化提供了一个数值值。他发现大约需要4.184焦耳的机械能来使1克水的温度上升1摄氏度。这个关系对于理解各种系统中的能量守恒和效率至关重要，从发动机到冰箱。在实际应用中，“机械等价热”的概念在工程和技术中发挥着重要作用。例如，在热电厂中，机械能转化为电能涉及理解燃料燃烧产生的热量如何高效地被利用。工程师在设计系统时必须考虑“机械等价热”，以最大限度地提高能量输出，同时减少浪费。此外，这一原理不仅仅局限于机械系统。在生物系统中，有机体将食物（化学能）转化为热量和机械能以维持生命。我们身体中的代谢过程就是“机械等价热”的例子，因为我们进行体育活动并维持体温。总之，“机械等价热”是一个重要的概念，它弥合了不同形式能量之间的差距。理解这一原理不仅增强了我们对物理法则的理解，而且为各个领域的实际应用提供了信息。在我们继续探索能量转化的过程中，焦耳工作的遗产仍然是科学探究和技术进步的基石。高效地转化和利用能量在我们寻求应对气候变化和能源匮乏等全球挑战的可持续解决方案时变得更加重要。