Milk weighs approx. 3% more than water. (That's regular cow's milk)
So, 1 fluid ounce would be 1.03 ounces by weight, hardly any difference.
But 1 US gallon (128 fl oz) would be 131.84 ounces by weight.
For cooking, the volumes of milk you would typically be dealing with are small enough that you can just pretend 1 fluid ounce equals 1 ounce.
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