Definition: | - for n quantities , reciprocal of the mean value of their reciprocals:
if none of the n quantities is equal to zero; if at least one quantity is equal to zero - for a quantity x depending on a variable t, quantity defined by the reciprocal of the mean value of the reciprocal of the given quantity:
if the value of the integral is finite; in other cases
NOTE 1 The harmonic mean value of a periodic quantity is usually taken over an integration interval the range of which is the period multiplied by a natural number. NOTE 2 The harmonic mean value of a quantity is denoted by adding the subscript h to the symbol of the quantity.
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