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Bipm: The International System of Units (Si)
BIPM (Bureau International des Poids et Mesures) is an international organization, located in France, an equivalent of our National Institute of Standards and Technology (NIST). This site is the BIPM intro page to their official...
Science Struck
Science Struck: Metric System Chart
Discusses how the metric system of measurement was developed, the organization around base units for some types of measurement, and the units used for other parameters.