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pallab
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The dielectric constant of water is 80, however its refractive index is 1 ·33 invalidating
the expression n*n=ε. why?
the expression n*n=ε. why?
No.Khashishi said:Dielectric constant and n are frequency dependent. Are you sure you got values at the same frequency?
The dielectric constant and refractive index are both properties that describe how a material interacts with electromagnetic waves. The dielectric constant measures the ability of a material to store and transmit electric charge, while the refractive index measures how much a material can bend light. In the case of water, both properties are closely related and can be affected by factors such as temperature and pressure.
This is due to the fact that the dielectric constant takes into account the ability of a material to store and transmit electric charge, while the refractive index only measures how much a material can bend light. Water has a high dielectric constant because it is a polar molecule with a strong dipole moment, allowing it to easily store and transmit electric charge. On the other hand, its refractive index is lower because water molecules have a relatively small size and do not cause significant light refraction.
The dielectric constant of water is affected by both temperature and pressure. In general, as temperature increases, the dielectric constant of water decreases. This is because as water molecules gain more thermal energy, they become more mobile and less able to store and transmit electric charge. On the other hand, increasing the pressure on water can cause an increase in its dielectric constant, as the molecules are forced closer together and become more polarizable.
Water has a relatively high dielectric constant compared to most other common substances. For example, the dielectric constant of air is 1, while the dielectric constant of water is 80. This is due to the polar nature of water molecules, which allows them to easily store and transmit electric charge. Other substances with higher dielectric constants than water include polar solvents like ethanol and acetone, which have dielectric constants of 25 and 21, respectively.
The dielectric constant and refractive index of water are important properties in many fields, including chemistry, physics, and engineering. In chemistry, these properties are used to study the behavior of water in different environments and to understand its role in chemical reactions. In physics, they are important in the study of light and electromagnetic waves, and in engineering, they are used in the design of electronic devices and optical instruments. Additionally, the dielectric constant and refractive index of water are important parameters in industries such as food and beverage, cosmetics, and pharmaceuticals, where water is a commonly used solvent.