Final answer:
When water at 4°C is heated, it undergoes phase changes from solid to liquid to gas as temperature increases.
Explanation:
When water at 4°C is heated, it first absorbs heat without a rise in temperature until it reaches 0°C, where it undergoes a phase change from solid to liquid. The heat energy then increases the temperature of the liquid water until it reaches 100°C, where another phase change occurs, transitioning from liquid to gas.
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