Parts Per Million or ppm
The weight to weight ratio used to describe concentrations, ppm is the number of units of mass of a contaminant per million units of total mass.
ppm - parts per million: Number of parts of a chemical found in one million parts of a solid, liquid, or gaseous mixture. Equivalent to milligrams per liter (mg/l).
PPM. Parts per million. Used interchangeably with mg/L (milligrams per liter.)
PPT. Parts per trillion.Used interchangeably with ng/L (nanograms per liter.) ...
ppm
Parts per million.
Prevalence
The number of existing disease cases in a defined population during a specific time period [contrast with incidence].
PPM: Parts per million.
Pressure, Total: In flowing air, the sum of the static pressure and the velocity pressure.
Pressure, Velocity: In flowing air, the pressure due to the velocity and density of the air.
ppm Parts per million. Also mg/L or milligrams per liter.
practical quantitation level (PQL) The lowest level achievable by good laboratories within specified limits during routine laboratory operating conditions.
ppm. Parts per million. Also mg/L or milligrams per liter.
prechlorination. The addition of chlorine at the headworks of the plant PRIOR TO other treatment processes mainly for disinfection and control of tastes, odors and aquatic growths.
ppm
A concentration unit of chemical constituents in solution; the weight of solute per unit volume of solvent, usually water, one thousand milligrams per liter is equivalent to 1 gram per litre, this measure is equivalent to parts per million.
PPM
Translations of "primary particle matter":
Language Translations
English: ...
ppm: Parts per million (10,000 ppm = 1%).
Precipitation: a) Formation of solids out of dissolved constituents; it is caused by a change in conditions (e.g. temperature) b) Water that falls to the ground surface from the atmosphere as rain, snow, hail, ...
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.
Pasteurisation ...
parts per million (PPM). Parts per million parts, a measurement of concentration on a weight or volume basis. This term is equivalent to milligrams per liter (mg/L) which is the preferred term.
Pascal.
Compared with C3 plants, C4 plants show little photosynthetic response to increased CO2 concentrations above 340 ppm but show a decrease in stomatal conductance, which results in an increase in photosynthetic water-use efficiency.
parts per million (ppm). a unit of relative volume used to measure very small quantities. One part per million is equivalent to one liter placed in a lake with the surface area of a football field and a depth of 8.8 inches (22.4 centimeters).
For low concentrations in water, milligrams per liter (mg/L) is about the same as parts per million (ppm). parts per billion (ppb) A way of expressing the concentration of a substance in air, water, soil or food.
Parts Per Billion (ppb)/Parts Per Million (ppm)
Passive Smoking/Secondhand Smoke
Passive Treatment Walls
Pathogens
Pathway
Pay-As-You-Throw/Unit-Based Pricing
Peak Electricity Demand
Peak Levels
Percent Saturatiuon
Perched Water ...
ppm parts per million, a measure of concentration, usually of some toxic substance. Laws are often framed say that effluents are permitted to contain some maximum amount of various pollutants each measured in ppm.
Parts Per Million (ppm) and Parts Per Billion (ppb) - These terms give scientists a way to describe how much of a substance is contained in a sample: parts of analyte per million parts of sample, for instance.
Recent measurements of carbon dioxide amounts from Mauna Loa observatory show that CO2 has increased from about 313 ppm (parts per million) in 1960 to about 375 ppm in 2005.
parts per million (ppm)
the unit commonly used to represent the degree of pollutant concentration where the concentrations are small. Larger concentrations are given in percentages. 1ppm = 1mg/L.
A relatively unstable compound of three atoms of oxygen, ozone constitutes -- on the average -- less than one part per million (ppm) ozone concentration in the atmosphere (peak ozone concentration in the stratosphere can get as high as 10 ppm).
Parts per million (ppm)
A measuring unit for the concentration of one material in another. When looking at contamination of water and soil, the toxins are often measured in parts per million.
hard water Alkaline water containing dissolved salts that interfere with some industrial processes and prevent soap from lathering.
hardnessThe levels of hardness in terms of parts per million of dissolved calcium carbonate are: 0-75 ppm ...
parts per million (ppm)
Weight units of any given substance per one million equivalent weight units of ovendry soil; or, for soil or other solutions, the weight units of solute per million weight units of solution.
peat ...
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.
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.
In the USA, non-regulatory health-based reference level of chemical traces (usually in ppm, i.e., mg L-1) in drinking water at which there are no adverse health risks when ingested over various periods of time.
Parts Per Billion (ppb)/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.
Zero Air: Atmospheric air purified to contain less than 0.1 ppm total hydrocarbons.
Zooplankton: Small (often microscopic) free-floating aquatic plants or animals.
1 milligram per liter (mg/L) =1 part per million (ppm) =1000 parts per billion (ppb)*
1 microgram per liter (mg/L) =1 nanogram per milliliter (ng/mL) = 1 part per billion (ppb) * ...
The relative amount of a substance mixed with another substance. An example is five ppm of carbon monoxide in air or 1 mg/l of iron in water.
Condensate ...
Concentration: The relative amount of a substance mixed with another substance. An example is five ppm of carbon monoxide in air or 1 mg/L of iron in water.
A non-regulatory health-based reference level of chemical traces (usually in ppm) in drinking water at which there are no adverse health risks when ingested over various periods of time.
Currently the concentration of carbon dioxide in the air is about 380 parts per million or 0.035 percent by volume. This concentration, however, is rising and is expected by scientists to reach 600 or more ppm by the middle of the next century.
ppm Parts per million. Pre-consumer Recycle Content A product composition that contains some percentage of manufacturing waste material that has been reclaimed from a process generating the same or a similar product.
 See also: Air, Water, Concentration, Waste, Compounds
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