Can you explain why ice melts at 0 C without an increase of tempertuare, even though heat is flowing from the surroundings into the system?
Zero C is the freezing point of water. Every molecule is vibrating, even in a solid lattice. As you add energy, in the form of thermal energy (heat), the water molecules in your ice cub will begin to vibrate more and more energetically. When they're fed enough energy, they can vibrate themselves out of the solid bonds and into the fluid, liquid bonds. The molecules remain bonded, but the bonds can change orientation, which allows water to slosh around and do the things that liquid water does.
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