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Is one inch Exactly 25.4 mm?

Updated: 8/11/2023
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Wiki User

9y ago

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Take out a ruler with English and metric units. Draw one inch on a piece of paper with a pen. Now turn to the other side of the ruler and read how long your line is. It should be around 2.5 cm. If you were able to refine your measurement (say with a vernier caliper) you would see that your line would be 2.54 cm (or 25.4 mm).

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13y ago
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7y ago

25.4 mm

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Q: Is one inch Exactly 25.4 mm?
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