Defines quantity with value and units. Made by faculty at the University of Colorado Boulder, Department of Chemical & Biological Engineering. Check out our Material & Energy Balances playlists: https://www.youtube.com/user/LearnChemE/playlists?view=50&flow=list&shelf_id=8 Check out our website for screencasts organized by popular textbooks: http://www.learncheme.com/screencasts/mass-energy-balances
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