A very hard concept to grasp for our students is the difference between a number and a measurement. Questions abounded today when we introduced significant figures for the first time. It is amazing the passion that can be exhibited when trying to understand whether or not a zero is a place holder or a significant figure. We need to be reminded that we are in science where we use measurements which have accuracy and precision. Please review these definitions! We also were in lab today practicing using instruments such as rulers, graduated cylinders, and balances to take accurate measurements. The good news is that we do not have homework this evening other than reviewing the rules for significant figures. Be prepared to do practice problems next class involving significant figures. Bring calculators to class. See you soon!
Mrs. E
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