Random errors:
Such type of errors are caused by the increase or decrease in temperature,humidity,pressure etc
And may cause of wrong observations.such type of errors may reduce due to availability of proper lab where external temperature or pressure are kept constant yet such errors never be removed forever.
Systematic errors:
Such errors are caused of inappropriate instruments in which zero error is present i.e positive zero error and negative zero error that effect on the reading however such errors may be removed by adding or subtracting errors in the final reading. If the zero of the main scale of vernier calliper does not match with the zero of the vernier scale then there is zero error in the instrument.if it is ahead of it then positive zero error in other case negative zero error in it.
Personal errors:
Such errors are caused by human negligence and through repetitive observation of the different readings several times over the same instrument.this error is also called human error in which chances of errors are expected due to inefficiency of human skills. Such errors are removed entirely through proper intension towards observations. Deliberate act of taking accurate reading may eliminate chances of such type of errors.
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