A micrometre ■
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A cent is a unit of area. A millimetre is a unit of length. The two units are therefore incompatible.
A 'micrometer' is a unit of length equal to one thousandth (10 -3) of a millimeter or one millionth (10 -6) of a meter. [For your information, - A 'nanometer' is a unit of length equal one thousandth (10 -3) of a micrometer, one millionth (10 -6) of a millimeter or to one billionth (10−9) of a meter].
Millimetre is a unit of length whereas, cc generally refers to cubic centimetres which is a unit of volume. They cannot be converted to one another.
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.
a millimetre