Uncertainty-Lab.docx

# 3 all measurements have a degree of uncertainty

• Lab Report
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3. All measurements have a degree of uncertainty regardless of precision and accuracy. This is caused by two factors, the limitation of the measuring instrument and the skill of the experimenter making the measurements. This experiment was conducted using redundant methods to verify our answers so the degree of uncertainty remaining in the measurements is insignificant in comparison to the final values. 4. Percent error is the difference between the true value of the measurand and the measured value. Percent error is used when comparing and experimental result E with a theoretical value T that is accepted as the correct value. Uncertainty characterizes the range of values within which the true value is asserted to lie with some level of confidence. Uncertainty often pertains to the act of measuring and calculating final answers whereas percent error is a comparison of measured results to accepted values. 5. This is the most important part of the lab result. When comparison values are available, we can decide if our results agree or disagree with a theoretical or accepted result. If the predictions disagree with the new experimental results, then the theory may be discarded as a description of reality. Also, there are many influential factors beyond the measurements alone, such as visual observations. The block that was used in this experiment had a off- brown colour to it which eliminated many other materials such as gold and silver. References
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• Fall '15
• Vernier scale, Caliper

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