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+clc;clear;
+//Example 1.7
+
+//constants used
+g=9.81;//acceleration due to gravity in m/s^2;
+
+//given values
+h1=0.1;
+h2=0.2;
+h3=0.35;//respective heights in m
+pw=1000;
+pHg=13600;
+poil=800;//density of water, mercury and oil in kg/m^3
+Patm=85.6;
+
+//calculation
+P1=Patm-(pw*g*h1+poil*g*h2-pHg*g*h3)/1000;//calculating pressure using liquid at same height have same pressure
+disp(P1,'the air pressure in tank in kPa is ')