Medicine/Medical. a regulated course, as of diet, exercise, or manner of living, intended to preserve or restore health or to attain some result. 2. regime (defs 1, 2). 3. Grammar. government (def 9). Origin of regimen.
1 Sodium azide is a rapidly acting, potentially deadly chemical that exists as an odorless white solid. 2  When it is mixed with water or an acid, sodium azide changes rapidly to a toxic gas with a pungent (sharp) odor. Breathing the gas that is formed from sodium azide causes the most harm, but ingesting (swallowing) sodium azide can be toxic as well. 2  The gas formed from sodium azide is most dangerous in enclosed places where the gas will be trapped. 3  The toxic gas quickly disperses in open spaces, making it less harmful outdoors.
Sodium: the essentials. Sodium is a Group 1 element (or IA in older labelling styles). Group 1 elements are often referred to as the alkali metals. The chemistry of sodium is dominated by the +1 ion Na + .Sodium salts impart a characteristic orange/yellow colour to flames and orange street lighting is orange because of the presence of sodium in the lamp. Soap is generally a sodium salt of fatty acids.roup 1 elements are often referred to as the alkali metals. The chemistry of sodium is dominated by the +1 ion Na + . Sodium salts impart a characteristic orange/yellow colour to flames and orange street lighting is orange because of the presence of sodium in the lamp.