Chemistry: Precision and Accuracy
http://www.mindbites.com/series/446 for a bundle of videos on Scientific Measurement. For an even broader bundle of videos that cover Scientific Measurement and Matter and Measurement Basics, check out http://www.mindbites.com/series/443 . To search for topic-specific help in our library of 400+ video products for Chemistry, please refer to our Chemistry category at: http://www.mindbites.com/category/24-chemistry . To check out our full Chemistry video course, with 300+ videos included, refer to: http://www.mindbites.com/series/549-chemistry-full-course . Or, for access to this single video, go to: http://www.mindbites.com/lesson/1297 . In this lesson, Prof. Yee discusses precision and accuracy in measurements. He explains that all measurements will have a degree of uncertainty due to instrumentation, and the range of uncertainty will appear in the last digit of the measurement. You want to have measurements that are both precise and accurate. Precision is the reproducibility of the measurement of a quantity and is tied to the concept of random error. Prof. Yee uses a ruler as an example of precision. Accuracy refers to how close a measurement is to a hypothetical true value. It is possible for a measurement to be precise but not accurate if there is a systematic error. Systematic error is an error inherent to the measurement of a value, such as a clock that is consistently 5 minutes fast. Finally, Prof. Yee explains the relationship between precision and accuracy using a game of darts. Taught by Professor Yee, this lesson was selected from a broader, comprehensive course, Chemistry.