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+// Example 2_1
+clc;clear;funcprot(0);
+// Given values
+p=100; // The pressure of air in kPa
+T=25+273; // The temperature of air in K
+R=0.287; // The gas constant of air in (kPa.m^3)/(kg.K)
+
+//Calculation
+
+rho=p/(R*T); // From ideal gas relation
+printf('The density of air,rho =%0.2f kg/m^3\n',rho);
+
+rho_1=1000; // Density of water in kg/m^3
+SG=rho /rho_1; // The specific gravity of air
+printf('The specific gravity of air,SG =%0.5f \n',SG);
+
+V=4*5*6; // The volume of air in m^3
+m=rho*V; // The mass of air in the room in kg
+printf('The mass of air,m =%0.0f kg\n',m);