Question: Consider the cistern manometer shown in Fig. P2.58. The scale is set up on the basis that the cistern area (A_{1}) is infinite. However, (A_{1})

Consider the cistern manometer shown in Fig. P2.58. The scale is set up on the basis that the cistern area $A_{1}$ is infinite. However, $A_{1}$ is actually 50 times the internal cross-sectional area $A_{2}$ of the inclined tube. Find the percentage error (based on the scale reading) involved in using this scale.

Figure P2.58

Air PH Air Oil, S = 0.85 0=30 A PL

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