* Ounces measure weight or volume: An ounce is a unit of mass (weight) or volume, depending on the context.
* Millimeters measure length: A millimeter is a unit of length.
To make a conversion, you need to know what you're measuring:
* If you're measuring weight (fluid ounces): You need to know the density of the substance to convert it to a volume and then to millimeters.
* If you're measuring volume (fluid ounces): You need to know the shape of the container holding the fluid to determine the equivalent volume in millimeters.
Let me know if you can tell me what you're measuring, and I can help you with the conversion!
