An ounce is a unit of mass, while a millilitre is a unit of capacity. Therefore, the two units are incompatible. A compatible unit of measure for ounces would be grams or pounds, while a compatible unit of measure for millilitres would be fluid ounces.
Answer: If you're cooking, 7 oz is just a bit over 207 ml. (My measuring cup shows both, but there are websites that will convert for you. See attached link.)
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