The experiment is conducted to investigate the validity of Bernoulli’s Theorem as applied to the flow of water in a tapered circular duct. The equipment used involves hydraulic bench, Bernoulli’s Theorem demonstration apparatus and a stopwatch. The most crucial part of the experiment is to measure the manometer level for each taping at the circular duct and to calculate their respective theoretical total head. The result obtained is then compared with the actual total head which is measured by the probe manometer level. The Bernoulli’s Theorem is valid only if the theoretical total head matches with the probe manometer level for each taping point. First of all, the tapered circular duct and manometer are filled with a steady flow of water by opening the inlet control valve. This is to ensure that there is no air bubble trapped in the tapered circular duct and the manometer. The inlet control valve is then opened to set to a certain arbitrary point on manometer level of the first taping. The readings of the manometer for all the six points are taken. After that, the hypodermic probe is inserted to measure the total head at each of the tapings. The experiment is conducted for four times with different initial manometer level while the flow rate of the fluid is maintained at constant throughout the experiment. The results are tabulated and calculated. From the results obtained, it can be seen that the theoretical total head is different from the experimental total head. This is because the Bernoulli’s Equation used in the experiment assumes that water is an ideal fluid which means it is inviscid, incompressible and has a steady flow. It is not true however in the real world. Furthermore, this situation arises may due to some errors occurred during the experiment, for instance parallax error, random error and so on which will later be discussed in the discussion section.