1. The experiments are performed under the control of the performer. Hence the problem of waiting for the occurrence of the event in nature does not arise is case of experiments.
If someone wants to study monsoon, then he has to wait till the time of monsoon to come. The object of observation is very often in the control of the nature.
If we arrange to observe it then it would become experiment. So the advantage of the experiment is that here waiting for the nature is not required.
2. The change, modification and repetition are possible in case of experiments as per the requirement. The performer of the experiment is the master of the situation.
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The experiment is always within his control. He can repeat or modify it as per his need. But such type of addition or alteration of conditions is not possible in case of observations.
3. Quantitative changes can be brought in case of experiments. This can be explained by the help of an example. A doctor experiments with a patient by applying certain medicine with certain doses.
He may experiment with it by increasing or decreasing the dose to study the result. Thus experiments can be undertaken by increasing or decreasing the quantity of the ingredients because quantitative changes are possible in case of experiments. But such quantitative charges cannot be brought in case of observation.