03 - Significant Figures Rules (Sig Fig Rules) for Calculations in Chemistry & Physics
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- čas přidán 22. 04. 2018
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In this lesson, learn how to properly count significant figures in calculations for physics and chemistry. We discuss the decimal point, leading and trailing zeros, and scientific notation for significant figures (sig fig) rules.
![Add, Subtract, Multiply, Divide w/ Significant Figures (Sig Fig Rules) - [1-1-15]](http://i.ytimg.com/vi/0z23aP6mM6w/mqdefault.jpg)
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Perfectly understood. Thinking about the "weakest link" is the easiest way, for instance in the case where 151 + 4,16 + 0,0220 ends up as just 155, if you had 151,000 + 4,160 + 0,0220 instead then you would keep the whole 155,138 as the final answer.
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40:55 let’s just say it was 151.0 that’s definitely an exact measurement.
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According to the rule that trailing zero after a decimal point are counted, can you explain how in 23:49 how that number could be anything else other then 3 S.D? Because, 100 is 3 S.D and, if it were to be 0.000100 it will still be 3 S.D. Unless you mean if there could be more trailing zeros at the end of 100, Which would make sense. Thanks for all your help I've never been good at chemistry or even math at that matter and trying to relearn and you're really helping me out!
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Awesome video thank you! The part at the end is really important. I was trying to figure out how we would change 4800 to just 3 significant digits. Thanks!!
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Jason, MathAndScience.com
Yeah, FWIW, it seems like that is the central intuition. For a number like 702, if you are confident in the precision of that 2, then you are certainly even more confident in the precision of the zero, and consider that significant. Because with the 2 you’re measuring a precision of how many ones; with zero you’re measuring precision of how many tens. Bigger things are much easier to measure precisely, so if you are confident you can measure the smaller thing quite precisely, then you would certainly be confident that you can measure the bigger thing quite precisely, and even more precisely.
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