Volume measurements will be made using a 25 mL graduated cylinder,  which has major scale divisions marked every 2 mL and minor scale division every 0.2 mL.What is the estimated uncertainty iin...

Volume measurements will be made using a 25 mL graduated cylinder,  which has major scale divisions marked every 2 mL and minor scale division every 0.2 mL.

What is the estimated uncertainty iin the volume measurements?

1 Answer

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justaguide | College Teacher | (Level 2) Distinguished Educator

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The uncertainty of a measurement is the extent to which the actual value may differ from the measured value.

This can be written as: measurement = best estimate +/- uncertainty

Here, volume measurements are being made using a 25 mL graduated cylinder which major scale divisions marked every 2 mL and minor scale divisions marked every 0.2 mL.

If a volume measurement is made using the cylinder and the value turns out to be X mL, it can be said with certainty that X lies between X + 0.2 mL and X - 0.2 mL. The uncertainty in measurements cannot be less than the smallest value that can be measured.

The uncertainty in the volume measurements made is 0.2 mL