By Anne Marie Helmenstine, Ph.D. Primary Standard Definition: A primary standard is a reagent which is very pure, representative of the number of moles the substance contains and easily weighed. Primary standards are typically used in titrations and other analysis techniques as standardization solutions.rimary Standard Definition: A primary standard is a reagent which is very pure, representative of the number of moles the substance contains and easily weighed.
fallo m (plural fallos) failure; verdict, decision; ruling; Verb . fallo. First-person singular present indicative form of fallar.
Define fall. fall synonyms, fall pronunciation, fall translation, English dictionary definition of fall. v. fell , fallÂ·en , fallÂ·ing , falls v. intr. 1. To drop or come down freely under the influence of gravity: Leaves fell from the tree. 2. a.