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diff --git a/172/CH3/EX3.8/ex8.sce b/172/CH3/EX3.8/ex8.sce
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+//example 8
+//calculating mass of air
+clear
+clc
+P=100 //pressure in kPa
+V=6*10*4 //volume of room in m^3
+R=0.287 //in kN-m/kg-K
+T=25 //temperature in Celsius
+m=P*V/(R*(T+273.2)) //mass of air contained in room
+printf("\n hence, mass of air contained in room is m = %.3f kg. \n",m)
+\ No newline at end of file