The reasons for errors can be as follows:
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The water level was fluctuating in the manometers because of the vibration in theequipment while readings were being recorded.
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If the water level reading is not taken from a proper view level, it will result in parallax error.
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The recorded time readings will have some inaccuracy because of time delaycaused by human reaction time. (i.e. not stopping the watch at exact time)
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The flow rates will be effected by the friction in the inner walls of the Venturimeter