Today we covered quantitative (measured) data collection. This type of data would include mass, length, volume, time, etc. We discussed precision and the limitations of measurement. We discussed the uncertainty associated with all measurements because of the estimation of the last digit of all measurements. For this reason, it is not proper to say the word "exact" when discussing a measurement. Exact implies that you can guarantee the measurement without any question. The problem with making that type of guarantee would be if another individual made the same measurement with a more precise instrument and found a value different than what you reported, you would be liable for guaranteeing the value. This is an extreme example, but you should use a term like precise. That gives you some wiggle room.
When can you say "exact"? Believe it or not, you can. When counting, you can say exact because there is no question that you have ten toes or 96 french fries (as long as you are careful counting).
Please finish the first page of the measurement worksheet tonight for homework. The page covers how to read 3 and 4 beam scales (balances). We will go over it first thing tomorrow. Please bring with you the piece of paper that has the mass of the card found in class today.
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