It is a measure measurement of the amount of error made in an experiment.
It is obtained by comparing the actual result, with the result gotten from the experiment.
% error = [(experimental value - true value) / true value] x 100
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Yes, your percent error can be over 100%. This means that somewhere during your experiment you made a big error.
When Percent Equal 100%
Divide the calculated or estimated error by the magnitude of the measurement. Take the absolute value of the result, that is, if it is negative, convert to positive. This would make the percent error = | error / measurement |.
Please explain the expression "error of brass" !