Parts Per Billion (PPB)

Business / Real Estate / Parts Per Billion (PPB): Units commonly used to express contamination ratios, as in establishing the maximum permissible amount of a contaminant in water, land, or air. These ratios can also be expressed in parts per million (ppm).

Parts Per Million (PPM)

Business / Real Estate / Parts Per Million (PPM): Units commonly used to express contamination ratios, as in establishing the maximum permissible amount of a contaminant in water, land, or air. These ratios can also be expressed in parts per billion MORE

Permanganate

Science / Chemistry / Permanganate: Permanganate ion (mno4-) is a powerful oxidizing agent used in chemical analysis and water treatment. The ion has an intense purple color. MORE

Permanent Vegetative Cover

Business / Agriculture / Permanent Vegetative Cover: Trees, or perennial grasses, legumes, or shrubs with an expected life span of at least 5 years. Permanent cover is required on cropland entered into the Conservation Reserve Program. MORE

Permeability

Business / Construction / Permeability: A measure of the ease with which water penetrates a material. MORE

Permian Period

Science / Biology / Permian Period: The last geologic time period of the Paleozoic Era, noted for the greatest mass extinction in earth history, when nearly 96% of species died out. MORE

Permeable

Life Style / Painting / Permeable: Allows another material to pass through without effecting the existing material. MORE

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