Which of the following best represents the temperature versus heat supplied graph for water, in the

Question

Which of the following best represents the temperature versus heat supplied graph for water, in the range of $-20^{\circ} \mathrm{C}$ to $120^{\circ} \mathrm{C}$ ?

Professor PC Thomas Classes · Answer

As heat is steadily supplied, the temperature of ice rises linearly from -20°C to 0°C. At 0°C, the ice melts, resulting in a horizontal line (constant temperature) as the latent heat of fusion is absorbed. After melting, the water's temperature rises linearly to 100°C. Since the specific heat of water is greater than that of ice, this slope is less steep. At 100°C, water boils, creating a longer horizontal line due to the much larger latent heat of vaporization. Finally, the steam temperature rises. This distinct step-like pattern characterizes the correct graphical representation.