I answered this same question, posted by a person with your name, nearly a week ago. Please read it again.
http://www.jiskha.com/display.cgi?id=1266639887
Given: the linear expansion coefficient of glass is 9 x 10^-6 ('C)^-1.
An automobile windshield has dimensions of 59 cm by 390 cm. What minimum spacing around the windshield is needed to prevent the windshield from breaking if the temp. changes by 146' F?
answer should be in units of mm.
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