Introductory Topics (Units, math, significant figures, etc.)

    NIST units; errors; etc. http://physics.nist.gov/cuu/

    Google Calculator:   http://www.google.com/help/features.html#calculator

    Unit Conversions : http://www.unitscalc.com/
   Dictionary of Measurements: http://www.unc.edu/~rowlett/units/

  Powers of Ten:    http://micro.magnet.fsu.edu/primer/java/scienceopticsu/powersof10/index.html

Old Units: http://home.clara.net/brianp/index.html

   Math Skills
    Fundamental Physical Constants
    NIST Constants, SI Units, and Error Analysis
    Units and Conversions:  http://www.megaconverter.com/index.html
    Significant Figures http://villa.lakes.com/thompson/sigdig/
    Sig.Figs., Intro: Bertrand::    http://www.umr.edu/~genchem/links.html     

    Stephen Lower, Matter & Measurement:     

        http://www.sfu.ca/person/lower/TUTORIALS/matmeas/

     T. Su at UMass Dartmouth:    

        http://www.umassd.edu/1Academic/CArtsandSciences/chemistry/Catalyst/sf.html
      Chem Team Sig Fig Rules and Practice Problems:  

            http://dbhs.wvusd.k12.ca.us/SigFigs/SigFigRules.html
       University of Maine:  http://oldblue.umeche.maine.edu/genchem/sigfigs.html
    English and Foreign Names of Elements and their Meanings     

        http://members.xoom.com/tneleme/index.html
    All about Units and Dimensions:  http://www.unc.edu/~rowlett/units/index.html
    Good! Scientific Notation and Measurement:     

        http://www.visionlearning.com/library/science/general-1/SCI1.3-measurement.htm