Experimental errors that cannot be revealed from many measurements are called systematic errors.

The system error is caused by some imperfections of instruments, limitations of measurement techniques or imperfections of experimental methods, which cannot guarantee the correct experimental conditions. For example, when the meter stops timing, it is inaccurate and slow, and the measurement interval is always too small.

The characteristic of accidental error is randomness. If we only measure some physical quantities once, their values may be greater than the true value or less than the true value, which is completely accidental, and the causes of accidental errors are uncontrollable, so accidental errors always exist. Accidental errors can be reduced by multiple average measurements, but they cannot be eliminated.

Since the error cannot be eliminated, we can only improve the method and do many experiments to reduce the error.

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