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Scientific Unit Converter
John Andrews, Bureau of Economic Geology, University of Texas: GIS's Tools Online. The site focuses on conversions commonly used by earth scientists, geographers, and field biologists. Unit conversions exist for length, area, deg min sec to dec deg, dec deg to deg min sec, scale calculator, and degrees to radians.
! Institute of Chemistry, Department of Biology, Chemistry, Pharmacy, FU Berlin: PHYSICAL QUANTITIES, CONSTANTS, UNITS. Go to: CONVERSION OF UNITS. Also available in German. Excellent!
Calculator.org: The Calculator Home Page. Calculator.org has a number of calculator related resources, including an online scientific calculator, units conversion and constants database, and other information. Visitors can also download Calc98, a free scientific, engineering, statistical and financial calculator for Windows and PocketPC.
Michael W. Davidson and the Florida State University (in collaboration with Optical Microscopy at the National High Magnetic Field Laboratory): Science, Optics and You: Powers of 10. Interactive java tutorial journeys in stages from 10 million light years beyond the Milky Way to a treetop to the nucleus at the heart of an atom, in order to visually describe orders of magnitude.
Frontiers in Bioscience: CONVERT MEASUREMENTS.
GISC  Great Innovation Systems Co., Ltd, Korea: Dictionaries and Unit conversion for Engineers. All in one page.
Google: Calculate with Google! As if Google weren't useful enough already, you can now use it as a calculator. How to use the Google calculator. The Google calculator can also convert between units, handle math functions and work with common physical and mathematical constants.
MicroSys ApS, Viby, Denmark: Unit Convert. Unit Convert Online can be used for a wide variety of conversion needs, e.g. metric measurements, lengths, areas, weights, volumes, temperatures, and fluids.
Process Associates of America: Conversion Factors. Including energy, H, S, Cp, P, V and T.
Reade Advanced Materials: Useful Conversion Charts. A selection of charts, e.g. unit conversion factors, the grit and microgrit grading conversion chart, units for particulate measurement, inches to millimeters conversion chart, mills to millimeter conversion, wire gage conversion chart, basic conversion factors and calendar conversion.
Russ Rowlett, Center for Mathematics and Science Education, University of North Carolina, Chapel Hill: How Many? A dictionary of units of measurement.
Frank Tapson, Centre for Innovation in Mathematics Teaching, University of Exeter: A Dictionary of Units. This page provides a summary of most of the units of measurement to be found in use around the world today, together with the appropriate conversion factors needed to change them into a "standard" unit of the Systeme International.
! unitconversion.org: Free Unit Converter. This site has over 2100 units in 78 categories, which range from those that are common, such as length, weight, volume, numbers, velocity, and pressure, to more specialized categories like magnetic flux density, electrostatic capacitance, and surface tension.
YAHOO: Science > Measurements and Units > Conversion >
Online Converters.
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