The dielectric constant varies, depending on the material.
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The dielectric constant of mineral spirits can vary depending on the specific composition and purity of the substance. Generally, the dielectric constant of mineral spirits ranges from around 2 to 3.
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'Dielectric constant' is an archaic term for relative
permittivity. They are one and the same.
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If the temperature increases, the conductivity will increase too
which means the dielectric constant is reduced