What are some factors that might contribute to uncertainty in a measurement?

All measurements have a degree of uncertainty regardless of precision and accuracy. This is caused by two factors, the limitation of the measuring instrument (systematic error) and the skill of the experimenter making the measurements (random error).

Systematic errors: they come from the instrumentation, they tend to be consistent in magnitude and/or direction, if this is known the accuracy can be improved by additive or proportional corrections. Additive correction involves adding or subtracting a constant adjustment factor to each measurement. Random errors: also known as human error, is determined by the experimenter's skill or ability to perform the experiment and read scientific measurements. Unlike systematic errors, random errors vary in magnitude and direction.

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