Common sense tells us a pound of muscle and a pound of fat have to weigh the same, but they do differ in density. This means if you look at five pounds of muscle and five pounds of fat side by side, the fat takes up more volume, or space, than the muscle.
Sorry, didn't explain as well as I should have
What I was trying to say is, if you had two people with the same body volume, but one of them had more fat than muscle, and the other one vice-versa, the person with more muscle would weight more.
Not sure if I'm making sense here though, kinda speaking what I've read trough time.
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