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The repeating sequence of digits is called "repetend" which has a certain length greater than 0, also called "period". [5] In base 10, a fraction has a repeating decimal if and only if in lowest terms, its denominator has any prime factors besides 2 or 5, or in other words, cannot be expressed as 2 m 5 n, where m and n are non-negative integers.
In laser physics however, the atomic ratio may refer to the doping ratio or the doping fraction. For example, theoretically, a 100% doping ratio of Yb : Y 3 Al 5 O 12 is pure Yb 3 Al 5 O 12 . The doping fraction equals,
Porosity or void fraction is a measure of the void (i.e., "empty") spaces in a material, and is a fraction of the volume of voids over the total volume, between 0 and 1, or as a percentage between 0 and 100%.