On each beam is a rider that slides across the beam. The pointer should always be at zero point before obtaining the mass of any object. The triple beam balance gets its name from three long, horizontal metal bars called beams connected to a pointer on the right-hand side. The instrument you will use most often to measure mass is the triple beam balance. Watch this video from TedEd to answer the question, "What's the difference between accuracy and precision?"īalances are used to measure mass. Precision as a measure of variation, must be accounted for in your calculations and results. Precision is how consistent your results are for the same phenomena over several measurements, or how repeatable a device's (like a spring's) performance can be made. Accuracy must be accounted for in your results. Measuring devices or techniques can easily be inaccurate and lead to false measurements, and no matter how accurate a device may be, there is still a tolerance for error. Two different and often confused concepts pertaining to measurements are accuracy and precision.Īccuracy is how close to "true" measurements are. Measurements are an important part of doing experiments. For example, how sure are you of them, and if you measure again, will you get the same result? For example, if you measured the acceleration due to gravity, did you get 9.8 m/s2? Precision describes the quality of your measurements themselves. Accuracy describes how close values are to widely accepted or published values. The difference between the definitions, however, is very important. Accuracy and precision have very similar definitions-both describe the quality of results in a laboratory experiment.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |