1-The laboratory manual specifies two types of errors in measurements. What are

Question

1-The laboratory manual specifies two types of errors in measurements. What are these errors? Briefly describe each kind and provide examples

2-What is meant by the terms (a) accuracy, (b) precision ? Definie and provide examples .

3-Definie the term absolute uncertainty. Give an example

4-Give a definition and an example of relative uncertainty

5- Define density and discuss what it means for this property to be an intrinsic property of material .

6- Look and record the literature values for the densities of aliminum, lead,and steel.

Explanation / Answer

measurement error and instrumental error

accuracy is is the degree of closeness of measurements of a quantity to that quantity's actual (true)value.

precision of a measurement system, related toreproducibility and repeatability, is the degree to which repeated measurements under unchanged conditions show the sameresults

Absolute error or absolute incertainty is the uncertainty in a measurement, which is expressed using the relevant units. Also, absolute error may be used to express the inaccuracy in a measurement.

Examples: If a measurement is recorded to be 1.12 and the true value is known to be 1.00 then the absolute error is 1.12 - 1.00 = 0.12. If the mass of an object is measured three times with values recorded to be 1.00 g, 0.95 g, and 1.05 g, then the absolute error could be expressed as +/- 0.05 g.

Relative uncertainty is a measure of the uncertainty of measurement compared to the size of the measurement

Three weights are measured at 1.05 g, 1.00 g, and 0.95 g. The absolute error is

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