Which of the following best represents the temperature versus heat supplied graph for water, in the range of -20°C to 120°C ?
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Question

Which of the following best represents the temperature versus heat supplied graph for water, in the range of -20°C to 120°C ?

G1 Physics · Accepted Answer

Starting with ice below 0°C: 1. From -20°C to 0°C, supplied heat raises the temperature of ice. 2. At 0°C, ice melts at constant temperature, so the graph has a horizontal segment. 3. From 0°C to 100°C, the temperature of liquid water rises. 4. At 100°C, water boils at constant temperature, giving another horizontal segment. 5. From 100°C to 120°C, the temperature of steam rises. Therefore the correct temperature-versus-heat graph must contain two horizontal phase-change plateaus, one at 0°C an…