What is the uncertainty for a 50mL cylinder? +/- 0.5 or 0.2 or 0.4? The cylinder goes up every 1mL. If the value is 11.5mL, how many sf would the value be?

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+/- 0.5 or 0.2 or 0.4? The cylinder goes up every 1mL. If the value is 11.5, how many sf would the value be? This is really confusing. Also, it would really help if you answered the q for a 10mL cylinder going up by 0.1cm3 as well :) Thank you!

Posted Sun 23rd December, 2012 @ 14:43 by Rue

1 Answer

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Right, so you have a 50ml cylinder, which measures to 1ml divisions. And using this measuring cylinder you measure 11.5ml (which is odd seeing as the cylinder only measures to 1ml increments, but i digress)

The +/- value for uncertainty is probably 0.5ml (as it is half of the smallest division), however I prefer to use uncertainty as a percentage of the measurement.

The % uncertainty of the measurement is (0.5 x Smallest division)/(quantity measured) x 100

This would give you: 0.5ml / 11.5ml x 100 = 4.35%

Answered Thu 3rd January, 2013 @ 17:35 by Andyman3001