I'm confused about the issue of Weight vs. Volume?

Can someone please explain the difference to me. Isn't an ounce an ounce no matter which way you measure it? And how do we tell if a food should be measured by weight or by volume? I'm so confused. I almost didn't ask this question because I felt so stupid, bu then I realized it's not really stupidity just inexperience because I'm still pre-op and have never bothered to measure my food intake before. I'd appreciate some education in this area please. Thanks

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