hydrogen

(hi'dro-jen) [G. hydor, water, + gennad, I produce.] An odorle , colorle , tastele element, gaseous at ordinary temperatures and pre ure; symbol H, atomic weight I. It is the lightest known substance, and the weight of one of its atoms is the unit of atomic weights. It is readily replaceable in many compounds by other elements or radicals, and this substitution of the hydrogen atoms in an acid forms a salt. h. dioxide, h. peroxide, oxygenated water, golden liquid; a colorle , syrupy liquid, HjOj, a powerful oxidizing agent, being used as a disinfectant in aqueous solutions of 15 to 20 volume strength, h. monox'ide, water, h. perox'ide, h. dioxide, sul'phtireted h,, h. sulphide, HjS, a colorle , inflammable gas of fetid odor, formed in the deconniposition of organic matter conta,ining sulphur.