1.Introduction
1.Introduction. Length-scales: 1Angstrom = 1 Ǻ = 1/10,000,000,000 metre = 10 -10 m 1 Nanometre = 1nm = 1/1,000,000,000 metre = 10 -9 m 1 Micrometre = 1µm = 1/1,000,000 metre = 10 -6 m 1 Millimetre = 1mm = 1/1,000 metre = 10 -3 m Interatomic distance ~ a few Ǻ
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