relative permittivity

简明释义

相对电容率

英英释义

例句

1.The relative permittivity of water is significantly higher than that of air, affecting signal transmission.

水的相对介电常数远高于空气，这影响了信号传输。

2.In capacitor design, knowing the relative permittivity of the dielectric is crucial for calculating capacitance.

在电容器设计中，了解介质的相对介电常数对于计算电容至关重要。

3.To optimize the performance of RF circuits, engineers must consider the relative permittivity of the substrates.

为了优化射频电路的性能，工程师必须考虑基板的相对介电常数。

4.The relative permittivity of a material determines how much electric field is reduced within it.

材料的相对介电常数决定了电场在其中被降低的程度。

5.Materials with high relative permittivity are often used in high-frequency applications.

具有高相对介电常数的材料通常用于高频应用。

作文

Relative permittivity, often denoted by the symbol εr, is a fundamental concept in electromagnetism that describes how an electric field interacts with a material medium. It is defined as the ratio of the permittivity of a substance to the permittivity of free space (vacuum). Understanding relative permittivity (相对介电常数) is crucial for various applications in electrical engineering, physics, and materials science.In essence, relative permittivity indicates how much electric field strength is reduced within a dielectric material compared to a vacuum. When an electric field is applied to a dielectric material, the molecules within the material become polarized, meaning they align themselves with the electric field. This polarization creates an internal electric field that opposes the external field, thereby reducing the overall electric field strength within the material.The value of relative permittivity can vary significantly depending on the type of material. For example, materials like glass or rubber have relatively high relative permittivity values, which means they can store more electric energy compared to air or vacuum. This property is essential in designing capacitors, which are devices that store electrical energy. The higher the relative permittivity, the greater the capacitance of the capacitor, leading to more efficient energy storage.Moreover, relative permittivity plays a vital role in the propagation of electromagnetic waves. In telecommunications, for instance, the speed of light in a medium is affected by its relative permittivity. The relationship between the speed of light in vacuum and in a material can be expressed as follows: the speed of light in a medium is equal to the speed of light in vacuum divided by the square root of the relative permittivity. Therefore, understanding the relative permittivity of materials is key when designing antennas and transmission lines to ensure optimal performance.Additionally, the relative permittivity of a material can also impact its thermal and mechanical properties. For instance, materials with high relative permittivity often exhibit better thermal insulation properties, making them suitable for applications in electronics where heat dissipation is a concern. Furthermore, the mechanical stability of materials can also be influenced by their electrical properties, including relative permittivity, which is critical in composite materials used in aerospace and automotive industries.In conclusion, relative permittivity (相对介电常数) is not just a theoretical concept but a practical parameter that influences a wide range of technological applications. From capacitors to telecommunications and material science, its significance cannot be overstated. As we continue to innovate and develop new materials, a deeper understanding of relative permittivity will be essential for advancing technology and improving efficiency across many fields.