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+//Example 5.15

+clc;

+clear;

+close;

+format('v',6);

+//Given data :

+D1=120/1000;//meter

+D2=120*0.55/1000;//meter

+g=9.81;//gravity constant

+A1=%pi*D1^2/4;//m^2

+A2=%pi*D2^2/4;//m^2

+Q=30/1000;//m^3/sec

+C=A1*sqrt(2*g)/sqrt((D1/D2)^4-1);//venturi constant

+K=0.94;//Coeff. of meter

+h=(Q/K/C)^2;//meter

+Z1=0;//meter

+Z2=0.3;//meter

+S=0.79;//sp. gravity

+w=1000*S;//kg/m^3

+delta_p=(h+Z1-Z2)*w;//kg/m^2

+delta_p=delta_p*g;//N/m^2

+disp(delta_p,"Pressure difference in N/m^2 : ");

+//answer is wrong in the book.