system
Given the following post, respond as if you're commenting on Reddit:
human
Why is it when a speck of something gets on my glasses (dandruff, dust, etc), blowing on it, no matter how hard, doesn't dislodge it from the presumably smooth surface?
gpt
Static forces that are commonplace between small particles and smooth plastic/glass surfaces are greater than the force you can generate by blowing across the surface. Small particles mean low surface area, which means low Reynold's number => means low Stokes number => means difficult to overcome the static forces by just blowing on it.