Cree
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www.cree.com Durham, NC 1000 to 5000 Employees

Cree Process Development Engineer Interview Question

I interviewed in Durham, NC and was asked:
"If a glass of water is half full and you put ice in it, when ice melts, the water level will increase of decrease or remain constant? Give scientific reason."
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Part of a Process Development Engineer Interview Review - one of 120 Cree Interview Reviews

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It will remain constant
- Interview Candidate on Feb 29, 2012 Flag Response
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The ice will float with a fraction of the ice cube sticking above the surface which is determined by the ratio of the density of water to the density of ice. Since these densities do not change as the ice melts, the fraction of ice above the water surface will never change. Since the fraction of ice above the water's surface never changes, the volume decrease of ice below the water surface during melting is always exactly replaced with an equivalent volume of melt. Therefore the water level in the glass will not change throughout the melting process.
- Interviewee Extraordinaire on Jan 31, 2013 Flag Response

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