Percent error tells you how far off an experimental measurement is from the accepted or theoretical value — a standard way to judge the accuracy of lab results..
Percent error tells you how far off an experimental measurement is from the accepted or theoretical value — a standard way to judge the accuracy of lab results.
A student measures the boiling point of water as 99.1°C, when the accepted value is 100°C. Percent Error = |99.1−100|/100 × 100 = 0.9%.
|experimental − theoretical| ÷ |theoretical| × 100.
It quantifies measurement accuracy compared to an accepted value.
Rarely — some measurement uncertainty is normal in real experiments.