To measure the accuracy of a quantity, to get the most accurate result is to repeat the measurement multiple times and then take an average of the results. The factor of errors can come through multiple ways including spillage of liquid, for example when transferring one liquid from a vessel into another, a small amount may be spilled losing the accuracy of the measurement. Also, if measuring a liquid there may be an error when measuring volume with the eye, if not observed correctly a volume measuring line may be read improperly.