Final answer:
The melting point and freezing point are at equilibrium, the triple point of water is fixed at 273.16 K, and as an ice cube melts, it undergoes a phase transition from solid to liquid.
Explanation:
Melting point and freezing point: The melting point of a substance is the same as its freezing point. At this temperature, the solid and liquid phases are in equilibrium. For water, this occurs at 0°C.
Triple point and absolute zero: The triple point of water is a fixed temperature of 273.16 K. Absolute zero is the lowest possible temperature, where particles have minimal motion.
Melting ice cube change: As an ice cube melts, it undergoes a phase transition from solid to liquid, resulting in the water temperature remaining constant until all the ice has melted.
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