dielectric constant

简明释义

介电常数

英英释义

例句

1.In capacitors, a higher dielectric constant means greater capacitance.

在电容器中，更高的介电常数意味着更大的电容。

2.Water has a high dielectric constant, making it an effective insulator.

水具有高介电常数，使其成为有效的绝缘体。

3.The dielectric constant of a material determines how much electric field it can store.

材料的介电常数决定了它能储存多少电场。

4.Materials with low dielectric constant are preferred for high-frequency applications.

低介电常数的材料更适合高频应用。

5.The dielectric constant of air is approximately 1, which is very low.

空气的介电常数大约为1，非常低。

作文

The concept of dielectric constant is fundamental in the field of electromagnetism and material science. It refers to a measure of a material's ability to store electrical energy in an electric field. More specifically, the dielectric constant is defined as the ratio of the permittivity of a substance to the permittivity of free space. This property is crucial for understanding how materials interact with electric fields and is particularly important in applications such as capacitors, insulators, and other electronic components.In practical terms, when a voltage is applied across a dielectric material, the material becomes polarized. This polarization creates an electric field that opposes the applied field, effectively reducing the overall electric field within the material. The degree to which this occurs is quantified by the dielectric constant. A higher dielectric constant indicates that the material can store more electrical energy, making it more effective for use in capacitors. For instance, materials like barium titanate and titanium dioxide have high dielectric constants, which makes them suitable for various electronic applications.Understanding the dielectric constant is also essential in telecommunications, where signals are transmitted through various media. The speed at which an electromagnetic wave travels through a medium is affected by the dielectric constant. This relationship is described by the equation: velocity = 1/sqrt(dielectric constant). Therefore, materials with lower dielectric constants allow for faster signal propagation, which is a critical factor in designing efficient communication systems.Moreover, the dielectric constant can vary significantly with frequency, temperature, and even moisture content in the material. This variability means that engineers must carefully select materials based on the specific conditions in which they will be used. For example, in high-frequency applications, a material with a stable dielectric constant is desired to ensure consistent performance. In contrast, in low-frequency applications, variations might not have as significant an impact.In summary, the dielectric constant is a vital property that influences how materials behave in electric fields. Its implications stretch across various fields, from electronics to telecommunications, making it a key concept for engineers and scientists alike. By understanding the dielectric constant, one can better predict how materials will perform under different conditions and design more efficient electronic devices. As technology continues to advance, the importance of the dielectric constant in developing new materials and improving existing ones cannot be overstated. It remains a central topic of research and application in both academia and industry, highlighting its enduring relevance in the modern world.

介电常数的概念在电磁学和材料科学领域中是基础性的。它指的是材料在电场中存储电能的能力的量度。更具体地说，介电常数被定义为某种物质的电容率与自由空间的电容率的比率。这一特性对于理解材料如何与电场相互作用至关重要，尤其是在电容器、绝缘体和其他电子元件等应用中。在实际操作中，当电压施加到介电材料上时，材料会被极化。这种极化产生一个电场，该电场对施加的电场产生反作用，从而有效地减少材料内部的整体电场。这种现象的程度通过介电常数来量化。较高的介电常数表明该材料可以存储更多的电能，使其在电容器中的应用更为有效。例如，钛酸钡和二氧化钛等材料具有较高的介电常数，使它们适用于各种电子应用。理解介电常数在电信中也至关重要，因为信号通过各种介质传输。电磁波在介质中传播的速度受介电常数的影响。这个关系可以用以下公式描述：速度 = 1/sqrt(介电常数)。因此，具有较低介电常数的材料可以实现更快的信号传播，这在设计高效通信系统时是一个关键因素。此外，介电常数可能会因频率、温度甚至材料中的水分含量而显著变化。这种变异意味着工程师必须根据材料将要使用的特定条件仔细选择材料。例如，在高频应用中，需要一种具有稳定介电常数的材料，以确保一致的性能。相比之下，在低频应用中，变异可能不会产生显著影响。总之，介电常数是影响材料在电场中行为的重要特性。它的影响跨越多个领域，从电子学到电信，使其成为工程师和科学家们的关键概念。通过理解介电常数，人们可以更好地预测材料在不同条件下的表现，并设计出更高效的电子设备。随着技术的不断进步，介电常数在开发新材料和改进现有材料中的重要性不容小觑。它仍然是学术界和工业界研究和应用的核心主题，突显了其在现代世界中的持久相关性。