Errors in measurement does not mean that the measurement is incorrect. It means that the measurement is not exact due to the measuring device or instrument.
The errors in measurement are classified into:
• Absolute error
• Relative error
• Percentage error
Absolute error is the difference between the actual value and measured value.
If the measured value is greater than the actual value, ignore the negative sign (-).
Relative error is the absolute error divided by the actual value.
Percentage error is the relative error in percentage form.