Parts Per Million
one part in a million. Abbreviated ppm and commonly used to express defect levels or concentrations. Passivation - a final layer or layers put on semiconductors to protect them against contaminants and mechanical damage. | ||||
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Parts Per Million definition was found in categories: Science & Technology(5) Society & Culture(3) Encyclopedia(1)
Parts Per Million Definition from Science & Technology Dictionaries & Glossaries
| NRC Nuclear Energy Glossary |
Parts per million (ppm)
Parts (molecules) of a substance contained in a million parts of another substance (e.g., water).
Parts (molecules) of a substance contained in a million parts of another substance (e.g., water).
| Energy Glossary |
PPM
(PARTS PER MILLION) - The unit commonly used to represent the degree of pollutant concentration where the concentrations are small.
(PARTS PER MILLION) - The unit commonly used to represent the degree of pollutant concentration where the concentrations are small.
| Glossary of water terms |
parts per million
the number of "parts" by weight of a substance per million parts of water. This unit is commonly used to represent pollutant concentrations.
the number of "parts" by weight of a substance per million parts of water. This unit is commonly used to represent pollutant concentrations.
| Physical Geography Terms and Meanings |
Parts Per Million ( ppm )
Number of parts of a substance found in one million parts of a particular gas, liquid, or solid.
Number of parts of a substance found in one million parts of a particular gas, liquid, or solid.
| General Chemistry Glossary |
parts per million
(ppm) Concentration expressed as parts of solute per million parts of solution. Usually refers to parts per million by mass. For example, a 10 ppm NaCl solution can be written as: 10 mg NaCl/kg solution, 10 µg NaCl/g solution, 10 ng NaCl/mg solution. In very dilute aqueous solutions, ppm is approximately equal to mg solute per liter of solution.
(ppm) Concentration expressed as parts of solute per million parts of solution. Usually refers to parts per million by mass. For example, a 10 ppm NaCl solution can be written as: 10 mg NaCl/kg solution, 10 µg NaCl/g solution, 10 ng NaCl/mg solution. In very dilute aqueous solutions, ppm is approximately equal to mg solute per liter of solution.
Parts Per Million Definition from Society & Culture Dictionaries & Glossaries
| EPA Glossary of Climate Change Terms |
Parts per million (ppm)
Number of parts of a chemical found in one million parts of a particular gas, liquid, or solid. See concentration.
Number of parts of a chemical found in one million parts of a particular gas, liquid, or solid. See concentration.
| EPA Terms of Environment |
Parts Per Million (ppm)
Unit commonly used to express contamination ratios, as in establishing the maximum permissible amount of a contaminant in water, land, or air.
Unit commonly used to express contamination ratios, as in establishing the maximum permissible amount of a contaminant in water, land, or air.
| Environmental Engineering (English ver.) |
Parts per million
Expressed as ppm; a measure of concentration. One ppm is one unit weight of solute per million unit weights of solution. In water analysis the ppm is equivalent to mg/l.
Expressed as ppm; a measure of concentration. One ppm is one unit weight of solute per million unit weights of solution. In water analysis the ppm is equivalent to mg/l.
PARTS PER MILLION (PPM)
The number of "parts" by weight of a substance per million parts of water. This unit is commonly used to represent pollutant concentrations. Large concentrations are expressed in percentages.
Parts Per Million Definition from Encyclopedia Dictionaries & Glossaries
| Wikipedia English - The Free Encyclopedia |
Parts-per notation
The "parts-per" notations are used to denote low concentrations of chemical elements. Also known as mixing ratios, they are often used to denote the relative abundance of trace elements in the Earth's crust, trace elements in forensics or other analyses, dissolved minerals in water, or pollutants in the environment.
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