Uncertainty of measurement is the doubt that exists about the result of any measurement. You might think that well-made rulers, clocks and thermometers should be trustworthy, and give the right answers. But for every measurement - even the most careful - there is always a margin of doubt. In everyday speech, this might be expressed as ‘give or take’ ... e.g. a stick might be two meters long 'give or take a centimeter'.
Take a look at the difference in measurement readings using these two different rulers.
Using the ruler below, how long is this leaf?
(measurement in centimeters)
Answer: about 3.56 cm
source: https://www.wmo.int/pages/prog/gcos/documents/gruanmanuals/UK_NPL/mgpg11.pdf
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