bonsoir
2 μm = 2 x 10 ⁻⁵
120 nm = 120 x 10 ⁻⁹ m = 120 x 10 ⁻¹² mm
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bonsoir
2 μm = 2 x 10 ⁻⁵
120 nm = 120 x 10 ⁻⁹ m = 120 x 10 ⁻¹² mm