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Summary: Energy capacity refers to how much energy can be stored or produced, and it varies widely by technology, region, and benefits. Worldwide energy capacity is increasing.

A dielectric constant is the measure of the amount of electrical energy that a substance allows to pass through itself. It also may be referred to as the relative permeability of the substance. The dielectric constant is the ratio of the degree to which a substance is permeable to the permeability of free space. All substances, including air, have a dielectric constant. The constant defines whether the substance is a good conductor or a good insulator.