Chemical Engineering
Paint has to be thin enough to brush and thick enough not to run. No ordinary liquid can be both
21 Sept 2026 · 11 min read
Ketchup that refuses to leave the bottle and then leaves all at once, toothpaste that stands up on the brush, paint that spreads and then stops flowing — these are the same trick. Their thickness is not a number. It depends on how hard you are pushing, and on how long ago you stopped.
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