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	Topics Astronomy Atomic clocks Bridges Calculators Earth's magnetic field Electricity Engineering Engines Fluids Gravity Lightning Measurement and real-life Miscellany Nobel Prize winners Optics Particle physics Physics meets biology Physics meets Earth science Scientist biographies Semiconductors and computers Sound Spacecraft Theme park physics Thermodynamics Tides Units of measurement		Topic: Units of measurement How Many? A dictionary of units of measurement An exhaustive dictionary of common, historical and bizarre units of measurement. Système International d’Unités The Bureau International des Poids et Mesures website explains the history and conventions of SI.