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Questions related to the solid phase of water.
22
votes
Why is the pond in my backyard not frozen when it is -15 °C (5 °F) outside?
it no longer sinks because ice has lower density than water). … This is why, if you travel north to Minnesota where ice fishing is common, they'll tell you the weather needs to be (mostly) below freezing for weeks before the lake is safe to walk/drive on. …