text: as pressure is directly proportional to density. so for fixed volume pressure is directly proportional to mass so\np1/p2 = m1/m2\np1=3400 p2=3600 m1= 1000 ltrs m2=x\nso we find m2=1058.82 ltrs\nso we need 58.82 ltrs convert into kgs\nby finding density of nitrogen gas.\nhope this helps