Level of a power quantity, denoted L_P, is defined by
: where
* P is the power quantity;
* P₀ is the reference value of P.

Field (or root-power) level

The level of a root-power quantity (also known as a field quantity), denoted L_F, is defined by
: where
* F is the root-power quantity, proportional to the square root of power quantity;
* F₀ is the reference

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