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+//Example 2.2  On Bernoulli's Equation
+
+// Initialisation of variables
+D1 = 8;
+P1 = 20*144;    //Gage Pressure in lb per square feet
+q = 1000;     //Rate of flow in gallon per minute.
+D2 = 4;
+Patm = 2116.2;
+rho = 62.4;
+
+// Calculations
+q = q*231/(1728*60);     //Rate of flow in ft^3/sec
+A1 = %pi*(D1/12/2)^2;       // Area in ft^2
+A2 = %pi*(D2/12/2)^2;
+V1 = q/A1;
+V2 = q/A2;
+P1_abs = P1 + Patm;
+P2_abs = P1_abs + (1/2)*rho*(V1^2 - V2^2)/32.2;     // Bernoulli's Equation
+P2 = (P2_abs - Patm)/144;    
+ 
+//Results 
+disp(P2, "The gage pressure in pipe at D = 4 inch (lb per sq in)  :");
+