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Pastimes : The New Qualcomm - write what you like thread. -- Ignore unavailable to you. Want to Upgrade?

To: John Dough who wrote (1071)	11/18/1999 12:36:00 PM
From: A.J. Mullen	Read Replies (1) \| Respond to of 12235

Water is at its most dense at approx 4 degrees. As ice is warmed, the heat is expended in melting it; the temperature doesn't rise at all if the water and ice are in equilibrium. Thus, as I said, your instincts are correct: the remaining ice continues float, that which melts occupies the same volume as was displaced by ice. Ice cubes floating above a full glass do not overflow when they melt. Once all the ice has melted, then the temperature will rise. The density will increase until 4 degrees Celsius. Thus, if, rather than a glass, we talk of a lens of water sitting on top of water warmer than 4 degrees, the cooler water would sink. Well, it would if it were all fresh. In the ocean, the mass of the water is salty and much more dense than the icemelt, which is fresh. I vaguely remember something very interesting happening with super-cooled brine, but that will have to wait til another day.