|Definition:|| quantity representing the quantities in a finite set or in an interval,|
- for n positive quantities , by the positive nth root of their product:
- for a quantity x depending on a variable t, by the quantity calculated from the values of the quantity x(t) by the expression
where is a reference value
Note 1 to entry: The geometric 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 to entry: The geometric mean value of a quantity is denoted by adding the subscript g to the symbol of the quantity.