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//example-17.3
//page no-515
//given
//atomic weight and density of magnesium
MMg=24.3 //gm
rhoMg=1.740 //g/cm^3
//molecular weight and density of MgO
MMgO=40.3 //gm
rhoMgO=3.650 //g/cm^3
//volume of Mg and Mgo
VMg=MMg/rhoMg //cm^3
VMgO=MMgO/rhoMgO //cm^3
//we know that pilling-bedworth ratio is given by
PBR=VMgO/VMg
printf ("since PBR is less than 1 so the film formed is not protective ")
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