Using the concept of supercooled water, explain why ice cubes sometimes feel “sticky” when taking them out of the freezer
What will be an ideal response?
ANSWER: Student answers may vary slightly. When we press on an ice block or icy surface with our fingers, the pressure that we apply causes an instant and localized melting on the ice surface under the fingers. Melting is also encouraged by our fingers' higher temperature. The layer of melted liquefied water freely flows into the grooves of our fingers where it freezes again. When we pull our fingers away from the ice we have to break the thin film of ice that connects our skin and the ice cube, which is why it feels ‘sticky'.
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