ParticulatesThe fine liquid or solid particles contained in combustion gases. The quantity and size of particulates emitted by cars, power and industrial plants, wood…
PetroleumAny petroleum-based substance composed of a complex blend of hydrocarbons derived from crude oil, including motor fuel, jet oil, lubricants, petroleum…
phloemSpecialized vascular plant tissue for the transport of assimilates (generally sugars) from the point of synthesis (in the leaf) to other parts of the…
photoconversionConversion of light into other forms of energy by chemical, biological, or physical processes.
PhotosynthesisA chemical process by which green plants synthesize organic compounds from carbon dioxide and water in the presence of sunlight.
polymer(PAH-lih-mer) A molecule made up of small identical molecules called monomers. The monomers are joined together in a repeating pattern.
polysaccharide(PAH-lee-SA-kuh-ride) A large carbohydrate molecule. It contains many small sugar molecules that are joined chemically. Also called glycan.
process development unitAn experimental facility that establishes proof of concept, preliminary process economics, and engineering feasibility for a pilot or demonstration plant.
Process HeatThermal energy that is used in agricultural and industrial operations.
protein(PRO-teen) A molecule made up of amino acids that are needed for the body to function properly.
Proximate AnalysisA commonly used analysis for reporting fuel properties; may be on a dry (moisture free) basis, as "fired", or on an ash and moisture free basis.
PyrolysisThe transformation on a compound or material into one or more substances by heat alone (without oxidation). Often called destructive distillation.