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Which statement is true about the colloidal gel in toothpaste under shear?
AIt becomes a gas
BIt turns to solid powder
CIt evaporates fully
DIt flows like a liquid
Answer & Solution
Correct answer: D. It flows like a liquid
Viscoelastic colloidal gels flow under shear but hold their shape afterwards, so toothpaste squeezes out yet stays on the brush.
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