None, but there are ten millimetres in one centimetre.
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One exactly
One centimeter is one one hundred'th of one meter.
10 millimetres is equal to 1 centimetre therefore 167 millimetres is equal to 16,7 centimetres
One cubic centimeter = 1cm^2 1 to the power of 2 = 1cm. In one centimeter, there are 10 millimeters.
Since the ounce is a unit of volume and the centimeter is a unit of length, one does not convert into the other.