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+// Example 3_3
+clc;clear;funcprot(0);
+// Constants used
+g=9.81;//The acceleration due to gravity in m/s^2
+
+// Given values
+h=1400;//m
+h_1=0.1;//m
+h_2=0.2;//m
+h_3=0.35;// respective heights in m
+P_atm=85.6; // The atmosphereic pressure in kPa;
+rho_w=1000;// kg/m^3
+rho_o=850;// kg/m^3
+rho_m=13600; // The density of water, mercury and oil in kg/m^3
+
+// Calculation
+P_1=P_atm+((rho_m*g*h_3)-(rho_w*g*h_1)-(rho_o*g*h_2))/1000;
+printf('The air pressure in the tank P_1=%0.0fkPa\n',P_1);