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Sciences > Physics Millimeters in an inch

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The international inch is defined exactly as 25.4 mm At one time an 'inch' was a imprecise measurement. Often each town or region would have its own version, an this itself would change from time to time. Measures were, and are, used in trade, and traditionally, in times of shortage or plenty, the prices of goods change. However, in the medieval era, it was frequently the custom to fix the price for a given named quantity, and then change the quantity as supply dictated. Thus, the price of cloth might be consistently a certain amount per inch or per yard, but the inch would be increased or...

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