text: Although some inorganic species can be obtained in pure form from nature, most are synthesized in chemical plants and in the laboratory.
  Inorganic synthetic methods can be classified roughly according to the volatility or solubility of the component reactants.  Soluble inorganic compounds are prepared using methods of organic synthesis.  For metal-containing compounds that are reactive toward air, Schlenk line and glove box techniques are followed. Volatile compounds and gases are manipulated in "vacuum manifolds" consisting of glass piping interconnected through valves, the entirety of which can be evacuated to 0.001 mm Hg or less. Compounds are condensed using liquid nitrogen (b.p. 78K) or other cryogens. Solids are typically prepared using tube furnaces, the reactants and products being sealed in containers, often made of fused silica (amorphous SiO) but sometimes more specialized materials such as welded Ta tubes or Pt "boats". Products and reactants are transported between temperature zones to drive reactions.