Eli5: Why is it so hard to scrape ice off my windshield?
In: 1
Windshields aren’t smooth at the microscopic level, there are tiny pits and cracks in it. You park your warm car, ice forms but against the warm glass a layer of it melts and fills the cracks, then as the car cools the water expands as it re-freezes. The ice gets jammed into the glass.
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