A substance has a freezing point of 24 °C. Which of the following is true for the substance? a. When the substance is heated, its temperature will start rising above 24 °C after 50% of the liquid has changed to vapors. b. When the substance is heated, its temperature will start rising above 24 °C after 100% of the solid has changed to liquid.
c. When the substance is cooled, its temperature will fall below 24 °C after 100% of the vapors have changed to liquid.
d. When the substance is cooled, its temperature will fall below 24 °C after 50% of the liquid has changed to solid.