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Topic: Parts-per notation

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In the News (Sat 20 Jul 19)

 Concentration - Wikipedia, the free encyclopedia
Parts per billion ('ppb') denotes one particle of a given substance for every 999,999,999 other particles.
Parts per million ('ppm') denotes one particle of a given substance for every 999,999 other particles.
Parts per trillion ('ppt') denotes one particle of a given substance for every 999,999,999,999 other particles. /wiki/Molarity   (1905 words)

 Parts Per Million To Parts Per Billion - How Much Is The Mega Millions -
Parts-per notation is a measure of concentration that is used where low levels of concentration are significant.
Parts Per Million (PPM) A unit of concentration often used when measuring levels of pollutants in air, water, body fluids, etc. One ppm is 1 part in 1,000,000.
Parts Per Billion (PPB) One part per billion is 1 part in 1,000,000,000... /how-much-is-the-mega-millions/parts-per-million-to-parts-per-billion.html   (506 words)

 MST Technology Glossary of Terms
Usually called simply "parts per million," a unit of measure of the concentration of one material mixed or dissolved into another.
Usually called simply "parts per billion," a unit of measure of the concentration of one material mixed or dissolved into another.
The concentration of a gas in a particulary volume (notation that is written for “percent by volume”). /europe/europe_resoures/glossary.htm   (1713 words)

 Academic Technology Center
In terms of weight per unit volume this remains a true per cent value, although it is not parts per 100 in terms of weight per unit weight.
Chemical concentrations in clinical toxicology are often expressed in parts per million (ppm), parts per billion (ppb) or parts per trillion (ppt).
The important consideration in the use of the term parts for the expression of relationships is that the same unit of measure or multiple of the unit must be used throughout all of the related portions of a procedure. /assets/courses/vm640/toxmathtutor/tocconc.html   (2553 words)

 Manual of fumigation for insect control - Principles of fumigation (cont.)
Parts per million of gases in air are used in human and mammalian toxicology and in applied industrial hygiene.
Parts by volume and percent by volume will be discussed together because both modes of expression give the relative numbers of molecules of gas present in a given volume of air.
In the literature it is often expressed numerically with the notation mg h/l (milligramme hours per litre) In this example it would be known as the lethal dose for 99 percent of the population, or the LD(99). /docrep/x5042e/x5042E03.htm   (2403 words)

 Parts Per Million Examples - 50 Million Legal Fees -
Parts per million refers to a ratio of weights...
a solution containing 10 to 200 parts per million parts by weight of the dicarboxylic acid of...
this is also expressed as parts per million (ppm). /50-million-legal-fees/parts-per-million-examples.html   (351 words)

 LabDiet® Overview
Micrograms per kilogram is equivalent to the notation "ppb" or parts per billion.
When the notation "ppm" is used, the component is being measured in parts per million.
Parts per million is also sometimes referred to as milligrams per kilogram, or mg/kg. /welcome_sum.htm   (559 words)

 Discovery Activity: Limits of Detection
Repeat the procedure used in the first two parts of this experiment, keeping track of your dilutions and recording all observations.
Express your limit of detection in terms of the most convenient units and in scientific notation.
Express the limit of detection in terms of the most convenient units and in scientific notation. /~holler/msc/discover/limits/detect.html   (781 words)

 ASN.1 Site - Introduction
One of the main reasons for the success of ASN.1 is that this notation is associated with several standardized encoding rules such as the BER (Basic Encoding Rules), or more recently the PER (Packed Encoding Rules), which prove useful for applications that undergo restrictions in terms of bandwidth.
ASN.1 is a formal notation used for describing data transmitted by telecommunications protocols, regardless of language implementation and physical representation of these data, whatever the application, whether complex or very simple.
But for a few addenda within the notation, the modifications were mainly editorial and consist in integrating amendments and technical corrigenda issued between 1994 and 1997. /en/introduction   (1152 words)

 Activity 24 Teacher Guide: Mixing Ratios or Parts per Million, Billion
Measurements such as parts per million can be expressed in terms of volume or mass.
With gases in the atmosphere, we usually think in terms of volume and may express this as parts per million by volume (ppmv).
Students will understand that a mixing ratio is the concentration of a certain substance expressed in parts per million or parts per billion by volume. /learn/1_5_2_24t.htm   (1105 words)

 MSDS Acronyms and Definitions
The LC50 is expressed as parts of material per million parts of air, by volume (ppm) for gases and vapors, or as micrograms of material per liter of air (g/l) or milligrams of material per cubic meter of air (mg/m3) for dusts and mists, as well as for gases and vapors.
ppm Parts per million is the concentration of a gas or vapor in air-parts (by volume) of the gas or vapor in a million parts of air; also the concentration of a particulate in a liquid or solid.
ppb Parts per billion is the concentration of a gas or vapor in air-parts (by volume) of the gas or vapor in a billion parts of air. /Pesticide/MSDS-Acronyms-Definitions.htm   (7331 words)

 Concentration lectures - parts per notation - ppm, ppb, ppt
"Parts per" is a convenient notation used for low and very low concentrations.
Concentration lectures » parts per notation - ppm, ppb
Generally speaking it is very similar to weight by weight percentage - 1% w/w means 1 gram of substance per every 100 g of sample and it is (although very rarely) named pph - parts per hundred. /?left=concentration&right=ppm-ppb-ppt   (215 words)

 Oxford Brookes University - Critical Connections Science Glossary - ppm
Modern analytical techniques are very accurate and may allow determination of extremely small concentrations of substances: parts per billion (1,000,000,000) or even parts per trillion (1,000,000,000,000).
The concept of parts per million is commonly used in science, to state, for example, the concentration of:
Here are some examples; the numbers in bold show which notation is conventionally used for that example. /geology/sedstruc/ppm/ppm.html   (228 words)

 Geodetic Coordinate Systems in Florida: GPS Contribution
The investigation shows that overall the relative accuracy of NAD 83 (1986) in Florida is between 1/200,000 and 1/500,000 or from five to two parts per million (ppm), yet still not as good as the two-dimensional results derived from GPS.
Measurements and results derived from the three-dimensional Global Positioning System (GPS) are more accurate than classical geodetic observations and methods used until recently to define conventional horizontal (geometric) data, e.g., the North American Datum of 1983, the final readjustment of which was finished in 1986, thus the notation NAD 83 (1986).
The situation may not be strictly the same with respect to vertical (physical) data such as the National Geodetic Vertical Datum of 1929 (NGVD 29) because an accurate geoid is required. /WWWdisplay.cgi?9101499   (197 words)

 Polyphony Notation Rules
The note head of the lower part should be aligned slightly to the left of the upper part.
The lower part should align further to the left/right of the upper part.
There are many different scenario's where two or more parts are required to be written on the same stave. /Frog/polyphony.shtml   (278 words)

39 C4_C8PPM Parts Per Million (ppm) all C4-C8 compounds.
This part begins at the 16th position of the WMO number.
Please note that throughout the text part of this document UNDERLINED words are actual table names and BOLD words are table elements (field/column titles). /akfinal/metadata/akdata.doc   (3376 words)

 ASN.1 Site - Standards - Encoding Control Notation
The Encoding Control Notation (ECN) allows specifiers to define their own encoding rules by referencing standardized encoding rules and modifying some of their characteristics (for example, one may want to use the whole standardized PER set but for the boolean values that would remain encoded on octets), or even to set up completely new ones.
In some of the new application areas however generalized encoding rules such as BER and PER are not efficient or flexible enough, what is needed is a unique application specific set of encoding rules.
The goal of the ASN.1 Encoding Control Notation (ECN) is to replace these informal encoding schemes with a standardized machine processable solution which will be powerful enough and flexible enough to handle the encoding needs of present and future application areas. /en/ecn   (600 words)

This result would provide a factor-of-20 improvement in the measurement of space curvature per unit mass (now known to about 2 parts in 1000) and would tightly constrain the deviations from GR predicted by other theories of gravity in the weak-field limit.
In addition to detecting the new gravitomagnetic effect of frame dragging, Gravity Probe B should be able to measure the geodetic precession of its gyroscopes to an unprecedented accuracy of about 75 parts per million (ppm).
The first of the two Einstein effects is called by relativists the 'geodetic effect.' The second is called the 'frame-dragging effect.' Each is minute but the gyroscopes are expected to determine frame-dragging to an accuracy of better than one percent, and the geodetic effect to a few parts in a hundred thousand. /gravity.htm   (1934 words)

 Salinity and Density of Seawater (from oceanography) --  Britannica Student Encyclopedia
A density difference can exist between two fluids or between different parts of the same fluid because of a difference in temperature, salinity, or concentration of suspended sediment.
mass of a unit volume of a material substance, expressed as kilograms per cubic metre in MKS or SI units; the densities of common solids, liquids, and gases are listed in textbooks and handbooks.
Density offers a convenient means of obtaining the mass of a body from its volume or vice versa; the mass is equal to the volume multiplied by the density, while the volume is... /ebi/article-205848   (907 words)

 USGS - Source, Movement, and Age of Ground Water in a Coastal California Aquifer
Oxygen-18 and deuterium abundances are expressed as ratios in delta notation as per mil (parts per thousand) differences relative to the standard known as Vienna Standard Mean Ocean Water (VSMOW).
Many of the remaining differences in the isotopic composition of ground water are the result of differences in the temperature of condensation (dew point) of precipitation in different parts of the basin.
Northern California water also was present in parts of the Santa Clara River valley, but its presence is less obvious because native water in the Santa Clara River valley is lighter than water in other parts of the basin. /archive/fact_sheets/b08/src.html   (812 words)

 Raggett on HTML4 - Chapter 1
Using HTML, you can specify which parts of your text are to be headings, paragraphs, bulleted lists, and which parts are to be rendered in bold-face type, in italicized type and so on.
Part of the Web's appeal is that almost anyone with a reasonable PC, Macintosh or UNIX computer can publish information without being unduly technical.
The only evidence you have that the requested information comes from far away is when a part of the Internet system is in heavy use and you have to wait. /People/Raggett/book4/ch01.html   (5740 words)

 Preparation of Standards for Dye Studies using Rhodamine WT
Other studies are described in milligrams per cubic meter (mg/m3) or parts per billion (ppb).
For example, if you have made a 100 parts per billion dilution based on 100% tracer, your final dilution will be 20 parts per billion active ingredient.
For example, in flow rate measurements you are only interested in how much a stream dilutes the dye, not what the actual concentration is. Thus, you do not need to know the concentration of the dye (in parts per billion or other units) when you calibrate your fluorometer. /t2/doc/appnotes/998_5111.html   (3247 words)

 Very STupid question about fishless cycling - MyFishTank.Net
PPM is the scientific notation for Parts Per Million.
There is also PPT, or Parts Per Thousand, and PPH, Parts Per Hundred, although PPH is most commonly expressed as a percentage (ie 10% not 10pph).
That would mean 50,000 Liters of solute is needed per every 950,000 Liters of solvent to create 1 million liters of solution, or a 5ppm mix. /forum/showthread.php?t=338   (679 words)

Data is given in parts per billion by weight (ppbw).
The composition of the structured organic matter is determined by a semiquantitative estimation method that is based on a procedure applied successfully for vegetation surveys (Hufnagel and Porth, 1989).
After having polished the blocks, maceral composition and vitrinite reflectance were measured under the microscope using incident light of 546 nm and fluorescence illumination with blue light irradiation. /odp/publications/164_SR/chap_05/ch5_3.htm   (593 words)

 Parts Per Million - ( PPM ) - Counting Atoms for hydroculture / hydroponics
Parts Per Million - (PPM) - Counting Atoms for hydroculture / hydroponics
The "practical" lab based system, that has been in use since the early 1900's, uses the notation of grams of an element in grams of water.
Create a table of the components based on the units and create a "short hand" notation for the relationship. /~wenonah/hydro/ppm.htm   (470 words)

 Extensible Markup Language (XML) 1.0 (Third Edition)
A NOTATION attribute identifies a notation, declared in the DTD with associated system and/or public identifiers, to be used in interpreting the element to which the attribute is attached.
In the document entity, the encoding declaration is part of the XML declaration.
This is an encoding signature, not part of either the markup or the character data of the XML document. /TR/2004/REC-xml-20040204   (8474 words)

 A Hybrid Magnetic Field Solver Using a Combined Finite Element/Boundary Element Field Solver
Magnet field density values of less than 10 parts per million can be attained with extremely few elements (approximately 20).
This problem is ideally suited for finite elements as the solution in the exterior space is irrelevant and many parts of the problem are highly saturated.
is known and is thus part of the source term. /papers/research/hybrid   (2342 words)

 IEER On-Line Classroom Practice with Scientific Notation
Scientific notation provides a place to hold the zeroes that come after a whole number or before a fraction.
The small number to the right of the 10 in scientific notation is called the exponent.
Remember that your answer should be expressed in two parts, as in the model above. /clssroom/scidrill.html   (862 words)

 Nat' Academies Press, Veterans at Risk: The Health Effects of Mustard Gas and Lewisite (1993)
parts per million, a volume to volume measurement that, at 25°C at sea level, is equal to 6.5 mg/m3 of sulfur mustard
Used in NRL reports to signify concentration (C) multiplied by time (T); equal to mg·min/m3, modern notation uses t to signify time (Ct)
The use of L to signify liters is confusing because L is also the abbreviation for Lewisite. /openbook/030904832X/html/32.html   (770 words)

 Methane Gas Levels Exceed Limits on Christine Drive
In October 1995 the city changed its notation method for the readings, dropping the parts per million entries and substituting readings showing the percent of LEL.
Hydrogen sulphide, the sewer gas that is deadly in heavy concentrations, was also present, although it was far short of the 300 parts per million that is considered immediately dangerous to life and health.
In some places, however, it was measured in excess of 100 ppm or more than10 times the recognized safe working level of 10 ppm. /methane/methane-200004.htm   (708 words)

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