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There are 1000000 nanometres in one millimetre. Therefore, 261 nanometres is equal to 261/1000000 = 0.000261 millimetres.

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13y ago

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1 nanometre is a million times smaller than a millimetre. This is because milli means 10^-3 and nano means 10^-9 metres. Therefore there are 0.000001 millimetres in a nanometre.

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11y ago
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To convert from nanometers to millimeters, divide by a million.

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Wiki User

11y ago
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209 nanometers = 0.000209 millimeters

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Wiki User

12y ago
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261 nanometers is 0.000261 millimeters.

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Wiki User

9y ago
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Q: How many millimeters are in 261 nanometer?
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