http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
High-pressure flows for propulsion applications
High-pressure flows occur in nature, in industrial processes and in manufactured devices but not in human personal experience which is limited to atmospheric pressure. In nature, high-pressure flows are found in petroleum reservoirs, at ocean depths, and in the atmospheres of planets such as Venus. In industry, the enhanced solubility that occurs at high pressures is used to extract certain chemical species; for example, the solubility of caffeine in supercrit.