Physics 5054 · O Level · Melting, boiling and evaporation

Melting, boiling and evaporation — practice question

A liquid sample at $100\,^\circ\text{C}$ is left to cool until it reaches a room temperature of $20\,^\circ\text{C}$. The graph shows the way the temperature varies with time as the sample cools. At what time is the sample fully solidified?

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