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It depends on the volume of milk. A drop of milk will have a different mass to a tankerful.
That's going to depend "heavily" on the weight of the empty pipe.
That completely depends on what's in the 12 fl oz. If they happen to be empty, then their weight is zero.
I'm not sure what you mean, but weighing by difference is when you:Take the weight of an empty container, fill the container with a substance.Take the weight of the container holding the substance.Subtract the empty container's mass from the mass of the container and the substance.You will then get the mass of the substance.The result is what is called the "Tare" weight. That is the weight of the contents ONLY .And that would not be the mass of the substance,,,it would be the weight. Mass is a determination of how much space is taken up by the substance.
The ships are not made of solid iron. They contain much empty space where the cargo and or passengers go. So the overall density of a ship: its TOTAL mass divided by its TOTAL volume is less than that of water.