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The process of measurement involves estimating the ratio of the magnitude of a quantity to the magnitude of a unit of the same type (length, time, mass, etc.). A measurement is the result of such a process, expressed as the product of a real number and a unit, where the real number is the estimated ratio. An example is 9 metres, which is an estimate of an object's length relative to a unit of length, the metre. Unlike a count, or integer quantity of items that is known exactly, every measurement is an estimate that has some uncertainty.
- A measurement is a comparison to a standard. -- William Shockley
- By number we understand not so much a multitude of Unities, as the abstracted Ratio of any Quantity to another Quantity of the same kind, which we take for Unity. -- Sir Isaac Newton (1728)
Practical Radio Frequency Test and Measurement: A Technician's Handbook (Paperback) recently tagged "electronic.. http://bit.ly/3JvbZp
hourlydeals (Hourly Price Checks) Sat, 07 Nov 2009 07:04:45 -0000
Practical Radio Frequency Test and Measurement: A Technician's Handbook (Paperback) recently tagged "electronic.. http://bit.ly/3JvbZp
dailyping Practical Radio Frequency Test and Measurement: A Technician's Handbook (Paperback) recently.. http://bit.ly/3JvbZp
dailyping (H) Sat, 07 Nov 2009 07:03:52 -0000
dailyping Practical Radio Frequency Test and Measurement: A Technician's Handbook (Paperback) recently.. http://bit.ly/3JvbZp
also for measurement of the impact (for example the relationship between friends and number of donation) are still in doubt
blogfestasia (Blogfest Asia) Sat, 07 Nov 2009 07:00:39 -0000
also for measurement of the impact (for example the relationship between friends and number of donation) are still in doubt
Visit 11/7 Alibaba New SellingLeads-Measurement & Analysis Instruments: Please add upda.. http://digg.com/u1Ft4m New ALibaba Lead
alibabaproduct (yane) Sat, 07 Nov 2009 07:00:28 -0000
Visit 11/7 Alibaba New SellingLeads-Measurement & Analysis Instruments: Please add upda.. http://digg.com/u1Ft4m New ALibaba Lead
WH Spokes-tool makes mendacity meter mark meteoric measurement.: Robert Gibbs pushed the deciet meter into the .. http://bit.ly/2CJwke
vermontaigne (Dan Collins) Sat, 07 Nov 2009 06:51:04 -0000
WH Spokes-tool makes mendacity meter mark meteoric measurement.: Robert Gibbs pushed the deciet meter into the .. http://bit.ly/2CJwke
@scandaljewelry you put the measurement for your necklace as earrings measurements fyi
rachaface (rachaface) Sat, 07 Nov 2009 06:35:19 -0000
@scandaljewelry you put the measurement for your necklace as earrings measurements fyi
Areas Provide Little Protection from Secondhand Smoke - Research measures secondhand smoke in no smoking areas, and finds that little protection is provided compared to the exposures in the smoking area.
A Molecular Dosimetry Approach to Assess Human Exposure to Environmental Tobacco Smoke - Recent research measures effects of exposure to secondhand smoke from single pub visit.
Assessing Exposure to Air Toxicants from Environmental Tobacco Smoke - Secondhand smoke measurements of acetaldehyde, acetonitrile, acrylonitrile, benzene, 1,3-butadiene, 2-butanone, o-cresol, m,p-cresol, ethyl acrylate, ethylbenzene, formaldehyde, n-nitrosodimethylamine, phenol, styrene, toluene, o-xylene, and m,p-xylene.
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Can Ventilation Control Secondhand Smoke - 57 page technical report analyzes the question, summarizes technical material, evaluates criteria and conclusions.
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Chemicals in Smoke - Factsheets and papers on: how cigarettes are tested for chemical content; total yearly chemical emissions from secondhand smoke; comparison of secondhand smoke and air pollution; estimates of amounts of 30 chemicals a restaurant worker would inhale in an 8 hour shift; description of tobacco smoke components; threshold limit values for chemicals found in tobacco smoke.
Environmental Tobacco Smoke and Lung Development - Online course in scientific investigation uses actual experiment performed on effects of secondhand smoke.
Environmental Tobacco Smoke: Exposure Measurements and Prevalence - Scientific report breaks down tobacco smoke constituents, their physical and chemical properties, and indoor air concentrations.
Exposure to Secondhand Smoke Widespread - CDC research finds that nearly 9 out of 10 Americans are exposed to secondhand smoke.
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Measuring Cigarette Exposure - Annotated bibliography of scientific papers mostly on measurement of exposure to secondhand smoke.
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Secondhand Smoke Toolkit in Public Places - CDC's page on secondhand smoke.
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Smoke-Free For Health - Studies - Collection of recent research studies on health effects of secondhand smoke.
Why Secondhand Smoke Cannot Be Controlled With Ventilation - Factsheet explains the pollution measurement and science of smoke concentration and buildup.
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