Edit: I was putting on a shrunken sweater and I thought maybe the fabrics were bunched together, so I started tugging at various parts of the sweater to try and loosen the strings. Then it occurred to me that it would never retain its previous shape. Is it just (optically, for lack of a better explanation) smaller because of the tighter fabrics, or did some of the (mass) escape and is somewhere else (ie in the air) or what?
In: Chemistry
Mass is essentially weight.
Shrinking is a comparative metric of volume.
Mass and Volume are unrelated except when discussing density.
Shrunken clothes are just more dense (same mass in a smaller size).
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