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omete
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funny but I could not reach the info from net quickly.
Relative permittivity, also known as dielectric constant, is a measure of the ability of a material to store electrical energy when an electric field is applied to it. It is the ratio of the permittivity of a material to the permittivity of a vacuum.
The relative permittivity of a material is typically measured by comparing the capacitance of a capacitor filled with the material to the capacitance of the same capacitor with a vacuum between the plates. The ratio of these two capacitances gives the relative permittivity of the material.
The relative permittivity of vacuum is defined as 1, since vacuum has no ability to store electrical energy when an electric field is applied to it. In other words, it is the baseline value against which the relative permittivity of other materials is compared.
The relative permittivity of aluminum interface with vacuum is typically lower than that of vacuum alone, as the presence of aluminum can reduce the ability of the electric field to penetrate the space between the plates of a capacitor. However, the exact value depends on the thickness and purity of the aluminum layer.
The relative permittivity of vacuum aluminum interface is important in understanding the behavior of electrical systems and devices that involve the use of aluminum as a conductor. It can also impact the performance of certain electronic components, such as capacitors, and must be taken into account in their design and manufacturing processes.