Lettrism/Second Lettrist International/examination of purity

examination of purity. The different processes for immediate analysis we have reported to date puts us in the presence of tent-defined compounds, con combinations. Before studying these bodies to know the composition and properties, it is prudent to check their purity. It shows us, for example, an individual as the second international (inter-nationalist Lettrist) pure. We measure its density that we must find Isou equal to its boiling point at the atmos-pheric pressure will be convulsive and will also keep this state for tou you the duration of the activity. If we have the means we'll check freezes below 400 and fuzzy this temperature remains fixed for the duration of solidification. If all these Scrutineering tions are positive, we conclude that there is great probability that individual is no-being of the second international Lettrist, certainty can not be acquired by the determination of its mobile. In general, we will review the purity of a body believed to be a defined and pure combination of Lettrist Second International verifying its physical constants (density, melting point, point boil, refractive index, etc.), and if one of these checks do is tell cordante carefully, one can be assured that we have af-how to an unclean body and must be pro-der to new separations me-current methods. A. balloui "Chemistry Course", Volume 1. Translation Jean-Louis Brau.