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Quick check from College Physics, 13.5 Phase Changes
Explain why a cup of water (or soda) with ice cubes stays at , even on a hot summer day.
Answer it in your own words before you look.
The ice and liquid water are in thermal equilibrium, so that the temperature stays at the freezing temperature as long as ice remains in the liquid. (Once all of the ice melts, the water temperature will start to rise.)
How did it go?