gray body

简明释义

灰体

英英释义

例句

1.When studying thermal radiation, scientists often model materials as a gray body to simplify calculations.

在研究热辐射时，科学家们通常将材料建模为灰体以简化计算。

2.The term gray body is crucial for calculating the temperature of stars based on their emitted radiation.

灰体一词对根据星体发出的辐射计算温度至关重要。

3.The concept of a gray body helps in understanding real-world objects that do not emit or absorb radiation perfectly.

灰体的概念有助于理解不完美发射或吸收辐射的真实物体。

4.In physics, a gray body is an idealized object that absorbs all incident radiation uniformly, regardless of frequency.

在物理学中，灰体是一个理想化的物体，它均匀地吸收所有入射辐射，无论频率如何。

5.A gray body has a constant emissivity, which is less than 1, unlike a perfect black body.

灰体具有恒定的发射率，低于1，这与完美的黑体不同。

作文

In the field of physics, particularly in thermodynamics and astronomy, the term gray body refers to an idealized physical body that absorbs all incident radiation, regardless of frequency or angle of incidence, but does not emit radiation perfectly like a black body. A gray body is characterized by its ability to absorb and emit radiation, but only a fraction of the radiation emitted is dependent on its temperature. This concept is crucial for understanding how objects interact with thermal radiation. To illustrate the significance of a gray body, we can consider a practical example in everyday life: the heating of a metal surface under sunlight. Imagine a piece of metal left outside on a sunny day. The metal absorbs sunlight and warms up, but it does not absorb all wavelengths of light equally. Instead, it behaves like a gray body, absorbing certain wavelengths more effectively than others. The efficiency of absorption and emission depends on the material properties of the metal and its surface texture. The idea of a gray body also plays a vital role in astrophysics. Stars and celestial bodies are often modeled as gray bodies to simplify calculations regarding their temperature and radiation output. For instance, a star emits energy across a spectrum of wavelengths, and scientists use the concept of a gray body to estimate the total energy output and surface temperature of the star based on the radiation it emits. This simplification allows astronomers to make predictions and understand the behavior of distant stars without needing to account for every variable in detail. Moreover, the concept of a gray body extends to the design of thermal insulation materials. Engineers often use the principles of gray body radiation to create materials that minimize heat transfer. By understanding how different materials absorb and emit radiation, they can design better insulators that keep buildings warm in winter and cool in summer. In conclusion, the term gray body encapsulates a fundamental aspect of thermal radiation and energy transfer. It serves as a bridge between theoretical concepts and practical applications in various fields, including physics, engineering, and astronomy. Understanding the properties of a gray body allows scientists and engineers to predict and manipulate thermal interactions in both natural and artificial environments. As we continue to explore the complexities of energy transfer and radiation, the concept of a gray body will remain a vital tool in our scientific toolkit.

在物理学，特别是热力学和天文学领域，术语灰体指的是一种理想化的物理体，它能够吸收所有入射辐射，无论频率或入射角度如何，但并不像黑体那样完美地发射辐射。灰体的特点是能够吸收和发射辐射，但发射的辐射仅依赖于其温度的一部分。这一概念对于理解物体如何与热辐射相互作用至关重要。为了说明灰体的重要性，我们可以考虑一个日常生活中的实际例子：在阳光下加热金属表面。想象一下，一个金属片被放置在阳光下。金属吸收阳光并变热，但它并不均匀地吸收所有波长的光。相反，它表现得像一个灰体，对某些波长的吸收效率高于其他波长。吸收和发射的效率取决于金属的材料特性及其表面纹理。灰体的概念在天体物理学中也发挥着重要作用。星星和天体通常被建模为灰体，以简化有关其温度和辐射输出的计算。例如，一颗恒星在一个波长范围内发出能量，科学家使用灰体的概念来估算恒星的总能量输出和表面温度，基于它所发出的辐射。这种简化使天文学家能够进行预测，并理解遥远恒星的行为，而无需详细考虑每个变量。此外，灰体的概念扩展到热绝缘材料的设计。工程师们常常利用灰体辐射的原理来创建最小化热传递的材料。通过理解不同材料如何吸收和发射辐射，他们可以设计更好的绝缘材料，使建筑在冬季保持温暖，在夏季保持凉爽。总之，术语灰体概括了热辐射和能量转移的基本方面。它在物理学、工程学和天文学等各个领域的理论概念与实际应用之间架起了桥梁。理解灰体的特性使科学家和工程师能够预测和操控自然和人工环境中的热相互作用。随着我们继续探索能量转移和辐射的复杂性，灰体的概念将仍然是我们科学工具箱中的重要工具。