Glossary P

The Environmental Glossary. Letter P +++ Popular Articles: 'Peak power', 'Parallel connection', 'Person'

A Particulate Matter is a tiny (microscopic) matter in the atmosphere. It might be solid or liquid.

A particulate pollution is Pollution made up of small liquid or solid Particles suspended in the atmosphere or water supply

particulates are Minute separate Particles of material, typically airborne.

A parts per billion is the number of "parts" by weight of a substance per billion parts of water. Used to measure extremely small concentrations.

A Parts per billion (ppb) is a unit commonly used to express a Concentration Ratio (proportion) equal to 10-9.

A parts per million is the number of "parts" by weight of a substance per million parts of water. This unit is commonly used to represent Pollutant concentrations.

A Parts per million (ppm) is a unit commonly used to express a Concentration Ratio (proportion) equal to 10-6.

A Passive radon/radon Decay product measurement device is a radon or radon Decay product measurement system in which the sampling device, detector, and measurement system do not function as a complete, integrated unit.

A passive solar is using or capturing solar Energy (usually to Heat water) without any external power.

A Pasture (or Pastureland) is Land used primarily for the production of domesticated Forage plants for livestock (in contrast to rangeland, where vegetation is naturally-occurring and

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