Lecture: Measurement. English system: Metric system:

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<ul><li><p>Lecture: Measurement</p></li><li><p>English system: Metric system:</p></li><li><p>Resolution:Smallest interval a tool can measure: how fine/close: # of decimal places: resolutions of your tv?Accurate:How close a measurement is to the true value: bulls-eye, cup/hole in golf?Precision:how close together repeated measurements are: arrows could be way off for accuracy but all grouped together; what could cause this?</p></li><li><p>When measuring you must ALWAYS determine what the resolution of the scale is.For the following scales, determine the resolution first, then measure for accuracy where the arrow points;Remember: no units = no credit</p></li><li><p>What is the measurement of the ruler at the arrow? Resolution?Accuracy?Units? </p></li><li><p>What is the measurement at the arrow?Resolution?Accuracy?Units?</p></li><li><p>How precise can this cm ruler be?What is the arrow measurement?</p><p>Resolution?Accuracy?Units?</p></li><li><p>Where is the arrow positioned?Resolution?Accuracy?Units?</p></li><li><p>Reading a graduated cylinder: always at the bottom of the meniscus</p></li><li><p>How much liquid is in this graduated cylinder?Resolution?Accuracy?Units?</p></li><li><p>What is the volume in this graduated cylinder?Resolution?Accuracy?Units?</p></li><li><p>What is the volume in this graduated cylinder?Resolution?Accuracy?Units?</p></li><li><p>Read the volume in the graduated cylinderResolution?Accuracy?Units?</p></li><li><p>What is the correct volume in the beaker?Resolution?Accuracy?Units?</p></li><li><p>Rounding RulesAccuracy also depends on roundingYour calculator will often give you a number indicating a greater degree of accuracy than possible (yes calculators can be wrong) soYou must roundWhen a # is &gt; to 5, round up: resolution to the tenth: 3.76 3.8When a # is &lt; 5, round down: resolution to the tenth: 5.14 5.1</p><p>*All are correct, the uncertainty depends on the eye the person measuring </p></li></ul>

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