FUNDAMENTALS OF MEASUREMENT: SI UNITS, CONVERSIONS, AND REAL-WORLD APPLICATIONS

Master measurement like a pro in one complete lesson. In this video, you’ll learn what measurement and units really mean, why the SI system matters, and how scientists and engineers use fundamental and derived quantities to solve real problems. You’ll see common measuring instruments across medicine, agriculture, engineering, and the lab, then practice unit conversions using SI prefixes and temperature formulas. We also break down concentration units (% , ppm, ppt, ppb), explain molarity clearly, and solve dilution problems using M₁V₁ = M₂V₂. Finally, you’ll understand accuracy vs precision and how calibration and repeated trials verify instrument performance. Stick to the end for practice questions to test your understanding. References: Bureau International des Poids et Mesures. (2025). Le Système international d’unités/The International System of Units (SI) (9th ed.). doi:10.59161/AUEZ1291 International Organization for Standardization, & International Electrotechnical Commission. (2017). General requirements for the competence of testing and calibration laboratories (ISO/IEC Standard No. 17025:2017). ISO. Joint Committee for Guides in Metrology. (2008). Evaluation of measurement data—Guide to the expression of uncertainty in measurement (JCGM 100:2008). BIPM. Joint Committee for Guides in Metrology. (2012). International vocabulary of metrology—Basic and general concepts and associated terms (VIM) (JCGM 200:2012). BIPM. Newell, D. B., & Tiesinga, E. (2019). The International System of Units (SI) (NIST Special Publication 330-2019). National Institute of Standards and Technology. doi:10.6028/NIST.SP.330-2019 OpenStax. (2019). Chemistry 2e. Rice University. (Section 3.3: Molarity). https://openstax.org/books/chemistry-... Thompson, A., & Taylor, B. N. (2008). Guide for the use of the International System of Units (SI) (NIST Special Publication 811, 2008 ed.). National Institute of Standards and Technology. https://physics.nist.gov/cuu/pdf/sp81... International Union of Pure and Applied Chemistry. (2025). IUPAC Compendium of Chemical Terminology (the “Gold Book”) (Version 5.0.0). IUPAC. International Union of Pure and Applied Chemistry. (2025). Molarity (M03977). In IUPAC Compendium of Chemical Terminology (the “Gold Book”) (Version 5.0.0). doi:10.1351/goldbook.M03977 International Union of Pure and Applied Chemistry. (2025). Amount of substance (A00297). In IUPAC Compendium of Chemical Terminology (the “Gold Book”) (Version 5.0.0). doi:10.1351/goldbook.A00297 International Union of Pure and Applied Chemistry. (2025). Amount concentration (A00295). In IUPAC Compendium of Chemical Terminology (the “Gold Book”) (Version 5.0.0). doi:10.1351/goldbook.A00295