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1 of 4 examples of dimension of physical quantity  Example1 .  Physicist Fermi once pointed out that a standard lecture period (50 min) is close to 1 micro century. Find the percentage difference from Fermi’s approximation? Solution :   Here, 1 micro century = 10 -6 × 100 years = 10 -4 years = 10 -4  × 365 × 60 min  = 52.56 min. Percentage difference = (actual – approximation) 100/actual =(50-52.56)100/50 = -5.12% So percentage difference from Fermi’s approximation will  -5.12% 2 of 4 examples of dimension of physical quantity   Example2 . Iron has a mass of 7.87 g per cubic centimeter of volume and the mass of an iron atom is 9.27×10 -26 kg. If the atoms are spherical and tightly packed, (a) What is the volume of an iron atom and (b) What is the distance between the centers of adjacent atom? Solution :   Here, mass/volume = density (Ρ)                ...