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Category: Start / Constants, Units and Conversions
Note - Effective 5 September 2006: This section of the databases at MeasurementDevices.com will be retained as is, but all updates and new entries, categories and improvements will be available only at the newer site, MeasurementDB.com.There are many websites with extensive information about units, unit systems and conversions between units for the same parameter in different systems. There are also some truely remakable online unit converters/calculators as well as some free and not free unit conversion software that can be downloaded and/or purchased online.
Sites currently sorted by: Title (A to Z)
A Dictionary of Units of Measurements 
From the University of North Carolina, this unique site includes:The International System (SI), broken down into:
SI Base (Fundamental) Units
SI Derived Units, and,
SI Units for Clinical Data in Medicine.
The English Customary Systems
The Metric System
The Metric System in the United States. There are also many unique tables of quantified parameters such as:
Apgar scoring (newborns)
Beaufort scales (wind speed)
Bushel weights (U.S.)
Cotton bale weights
Danjon scale (lunar eclipse brightness)
Drought severity (U.S.)
Fujita scale (tornados, U.S.)
Glasgow coma scale
Grit sizes
Hat sizes
Mercalli scale (earthquakes)
Nutritional daily values (U.S.)
Paper sheet sizes: British ISO, and U.S.
Radiocarbon year conversion
Saffir-Simpson scale (hurricanes, U.S.)
Sheet metal gauges
Shotgun gauges
Solar flare intensity
Tennis rcquet gauges
Tropical cyclone categories (Australia)
Viscosity grades (ISO)
Volcanic Explosivity Index
Wind chill chart (U.S.)
Wire gauge table (U.S./U.K.)
More are added regularly.
This site also feature very useful explanations and details on using numbers and units, Roman and Arabic numerals, names for large numbers and symbols and abbreviations used for various units.
Added on: 28-Jun-2004 | hits: 966
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CODATA Fundamental Physical Constants
Information on the foundation of modern science and technology from the Physics Laboratory of NIST. NIST Standard Reference Database 121; Last updated February 2006.
Added on: 12-May-2006 | hits: 547
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Conversion Calculator(568Kb download)
This program, hosted in the Philadelphia ISA Section website (www.isa-philly.org/), allows one to perform conversions of distances, pressure, force, mass, temperature, torque, volume, and several other parameters with just a few clicks of a mouse!!.
Submitted by Sam Herb , a long-term member of the Section, (568Kb download) Added on: 14-May-2006 | hits: 723
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Conversion Factors
These conversion factors were taken from a variety of sources. If you see Br, it means British and Fr it means French. We have tried to be as accurate as possible, but if you find any errors, please drop us a line.Added on: 14-May-2006 | hits: 648
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Conversion for energy equivalents
NIST's online conversion tool and set of conversion factors.Added on: 12-May-2006 | hits: 606
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