A rugged instrument used frequently for monitoring gas velocity in smokestacks consists of two open tubes oriented to the flow direction as shown and connected to a manometer. The pressure coefficient is 1.0 at A and –0.2 at B. Assume that water, at 20°C, is used in the manometer and that a 5 mm deflection is noted. The pressure and temperature of the stack gases are 101 kPa abs and 250°C. The gas constant of the stack gases is 200 J/kg∙K. Determine the velocity of the stack gases.

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B Ah Flow direction