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Infinite Significant Figures in Exact Numbers

What's an EXACT NUMBER, and why are we uncertain about so many other number? Learn how to recognize exact numbers and how to deal with their sig figs. An exact number has no uncertainty and infinite significant figures. If there are 6 people in a closed room, 6 is an exact number. Think of it as 6.0000000...zeros on to infinity. These numbers are the result of a count or a definition, not a measurement. Watch the whole playlist:    • Significant Figures   Playlists to ACE Chemistry:    • General Chemistry Basics That Matter      • The Benzene Puzzle & Aromaticity   Can you solve it?    • Organic Chemistry Essentials | Reactions, ...      • Lab Techniques & Instrumentation      • Fun Stuff   Educating entertainment    • DIY Chemistry   PATREON:   / chemistryinanutshell   Time Stamps: 0:00 Introduction 0:47 How to recognize exact numbers 2:05 Measured values have finite sig figs 2:48 How to recognize exact definitions 3:21 Look for "Exact" or "Exactly" 3:51 Unit Conversion with an Exact Definition (3280 m to km) #SignificantFigures #SigFigs #Chemistry