A rule of thumb is that one hectare of land area, taken to the depth of the plow layer weighs two million kilograms. ie. 30 ppm equals 60 kilograms per hectare.

A unit, which may be mass/mass, and hence represents a direct measure of fractional mass, or volume/volume, and represents in this case, a molar fraction at low pressures and high temperatures, commonly used to represent the degree of pollutant concentration where the concentrations are small.

A measure of air pollutant concentrations.

Pesticide residues are normally measured in these units. One part per million equals one part of a chemical per million parts of the commodity.

the number of parts of a given pollutant in a million parts of air

A quality measure of the number of defective items observed or projected out of a population of one million.

A measurement used to calculate the "parts per million" or "pounds per million pounds" of the chlorine, hardness, and alkalinity in your pool water.

A measure of concentration of a dissolved substance. Compare milligrams per liter.

the number of 'parts' of a unit per million parts of the total

a unit that is used to measure the concentration of a substance in a given area. Chemical exposures are usually given as the number of molecules of a chemical within a million molecules of air. One part per million is equal to one drop of water in 18 gallons of water, or one inch in 16 miles.

A unit of concentration. For example, air that contains 1 part per million formaldehyde contains 1.2 milligrams formaldehyde in 1 million milliliters air, i.e. 1000 liters air.

Units typically used in measuring the number of "parts" by weight of a substance in water; commonly used in representing pollutant concentrations.

A measuring unit for the concentration of one material in another. When looking at contamination of water and soil, the substances are often measured in parts per million. One part per million is equal to one gram of substance in one million grams of material.

a dilution factor of one part of one substance in a million parts of another; used to express nutrient formulations and calculations of amounts of various fertilizers to use in a given volume of water; also equivalent to 1 milligram (element) per liter (water)

A measure of frequency compared to the centre frequency of the oscillator. It is defined as one Hertz per Megahertz of the oscillator frequency.

A relative term typically used in drift specifications. One part per million is equivalent to 0.0001

Specifies the concentration by volume of a substance dispersed in another substance

the number of grams of solute in a million grams of solution, or the number of mg. of solute in 1000 g or 1 L of solution. The most convenient units are mg/L.

Compare? One ppm is comparable to one drop of gasoline in a tankful of gas (full-size car).

A measurement used to express very small concentrations of a given substance present in a mixture; often used as a unit to measure the parts (by volume) of a gas or vapor in a million parts of air.

The standard measure used to express the quantity of substance in the water.

A method of calculation used to specify the permissible frequency deviation of a crystal or oscillator. May also be abbreviated as ppm. Both are correct.

A common basis of reporting water analysis. One part per million (ppm) equals one pound per million pounds of water.

A measure of concentration of a dissolved substance. Also known as ppm.

A unit of concentration often used when measuring levels of pollutants in water. One ppm is 1 part in 1 000 000. The common unit of milligram/litre is equal to ppm.

one part per million (ppm) equals 1 pound chemical per million pounds of water.

A concentration which expresses the amount of a chemical contaminant (parts) of air or water.

quantitative measurements used to describe the level of a substance in question. Example: One PPM is equivalent to 1 square inch within the infield of a baseball diamond; one PPB is equivalent to one second in 32 years; and one part per trillion (PPT) is equivalent to 1 square foot in the state of Indiana.

(PPM) - unit of measurement for concentration of gas or vapor in air - 1 ppm = .0001%. In Perspective: 1 inch/16 miles or 1 ounce/31 tons of potato chips

A unit of concentration. One part per million can be compared to one cent in $10,000.

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.

A measure of proportion by weight, equivalent to one unit weight of a material per million (106) unit weights of compound. One part per million is equivalent to l mg/g

(ppm) The number of weight or volume units of a minor constituent present with each one million units of a solution or mixture. In water-related issues the more specific term milligrams per liter (mg/L) is preferred. In air-related issues the more specific term milligrams per litervolume (mg/Lv) is preferred.

A unit of chemical concentration.  The concentration of a chemical is 1 ppm if one weight unit of chemical (for example, 1 milligram) is dissolved in one million weight units of water (1,000,000 milligrams of water = 1 liter).  Very low concentrations of chemicals may be expressed in parts per billion or high concentrations in parts per thousand.

an expression of concentration. It is the number of units of one substance in a million units of all particles of the mixture. For example, 10 units of SO in one million units of air is 10 ppm.

(ppm) unit of measure most often used to describe the amount of a particular gas or compound in the air or water; it is the proportion of the number of molecules of the gas or compound out of a million (1,000,000,000) molecules of air or water.

The unit measure of the concentration of a component substance. For example a 1 ppm concentration of iron is 1 part iron to 999,999 parts of other material. It also is equal to mg/L.

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 (ppb)."

In everyday terms, one part per million would be equal to one second in 11 days. Numerically, one part per million looks like 0.000001.

A common basis of reporting water analysis in the United States and Canada. One ppm indicates 1 pound of material per million pounds of water.

Represents the concentration of something in water or soil. One ppm is equivalent to 1 milligram of something per liter of water (mg/l) or 1 milligram of something per kilogram soil (mg/kg). ( abbrev. ppm)

Measurement used to identify the amount of lead in paint. It is the weight of lead per 1,000,000 weights of a sample, including the lead. For example, if a paint sample contains 5,000 micrograms of lead in 1 gram of paint, then the lead concentration is 5,000 ppm.

An expression for concentration (see Milligrams per Liter); the quantity of one substance contained in 1 million units of another substance when both are measured by identical terms. For solutions (substances dissolved in liquids), it is the number of units of the substance contained in 1 million units of solution.

Constituents in water are often measured in very small units. Many of the dissolved minerals such as sodium and calcium are monitored by Tucson Water are measured in terms of parts per million (or milligrams per liter). To help you visualize how very small this unit is, we offer the following illustrations. One part per million equals: 1/4 ounce of water in a typical 15,000 gallon backyard swimming pool One second of time in eleven point six days

The concentration of a substance in air, water or soil. One ppm means that there is one part of a substance for every million parts of the water or soil in which it is measured. One ppm is about one drop of dye in 18 gallons of water, about one inch in 16 miles, or one penny in $10,000.

ppm. Refers to concentration by weight for both solute and solution. Parts per million (wt./wt.) differs from mg/liter (wt./vol.) when the specific gravity of the solution differs from that of pure water at standard conditions. Many salinities that have been measured in units of mg/liters are reported routinely in ppm without proper conversion to ppm.

A measurement of concentration on a weight or volume basis. This term is equivalent to milligram per litre (mg/L), the preferred term.

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.

A measure of concentration, referring to the number of molecules of air treatment agent in every one million molecules of air. This measure is used where low levels of concentration are significant.

A unit (abbreviated as ppm) used to measure dissolved oxygen and other chemicals. It is a measure of concentration, not absolute amounts. For example, one inch in sixteen miles is one ppm. [Note: 1 mg/L = 1 ppm

PPM is a way of stating the performance of a process in terms of actual or projected defective material. PPM data can be used to indicate areas variation requiring attention.

Represents the concentration of gases or vapor in air. For example, 1 ppm means that 1 unit of the gas is present for every 1 million units of air..

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.

Typically used in the context of defect Parts Per Million opportunities.  Synonymous with DPMO

A volume unit of measurement; the number of parts of a substance in a million parts of another substance. For example, 10 ppm nitrate in water means 10 parts of nitrate in a million parts of water.

Also equivalent to milligrams per liter (mg/l) - a measurement of weight, usually used in expressing amounts of minerals in water.

(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.

A measurement of the concentration of a substance in a liquid. For example, 3 ppm equals 3 pounds of a substance for a million pounds of a liquid.

(ppm) A common unit of measure used to express the number of parts of a substance contained within a million parts of a liquid, solid, or gas.

Indicates the number of parts by weight of a dissolved or suspended constituent, by weight of water or other solvent. In dilute water, one PPM is practically equal to one mg/L.

A measurement of concentration of one unit of material dispersed in 1 million units of another.

A common basis of reporting soil analysis. For example, one part per million (ppm) of TCE equals one ounce of TCE in one million ounces of water.

a ratio figure that represents the amount of one substance that is in one million parts of another substance; commonly used to describe the relative concentrations of nutrient solutions.

A unit of measurement used for chlorine, bromine, total alkalinity, calcium hardness and total dissolved solids.

(ppm)--See milligrams per liter.

( ppm) Number of parts of a substance found in one million parts of a particular gas, liquid, or solid.

(ppm) measurement used to describe very small concentrations of chemicals; a solution having a concentration of 1 ppm has one part of solute per million parts of solution

Equivalent to milligrams per liter. One ppm is comparable to one drop of water in 55 gallons.