2,54 cm
3 barleycorns
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a twelfth (1/12) of a foot or a thousand (1000) thou.
1 inch is not equal to 25.4. 25.4 is a pure number whereas 1 inch is a measure of length. By definition, 1 inch is equal to 25.4 millimetres, where a millimetre is another unit for measuring length.
1 inch = 2.54 centimeters
1 inch=25.4 millimeters
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