1. Flat Section 1 (Solid Phase): The first flat section of the graph represents the solid phase of the substance. In the case of ice melting, this would be the temperature range where the ice remains solid.
2. Slope (Phase Transition): The slope on the graph indicates the phase transition from solid to liquid. For ice melting, this would be the temperature range where the ice is actively melting and turning into water.
3. Flat Section 2 (Liquid Phase): The second flat section of the graph represents the liquid phase of the substance. In the case of water boiling, this would be the temperature range where the water remains liquid.
4. On Mark When Ice Melting: The "On mark" typically refers to the temperature at which the phase transition occurs. For ice melting, the "On mark" would be the temperature at which the ice starts to melt and the slope begins. This temperature is usually 0 degrees Celsius (32 degrees Fahrenheit) at sea level.
5. On Mark When Water Boiling: Similarly, the "On mark" for water boiling would be the temperature at which the liquid water starts to boil and turn into water vapor. This temperature is usually 100 degrees Celsius (212 degrees Fahrenheit) at sea level.
By analyzing the shape of the graph and identifying the flat sections and slopes, you can understand the phase changes of the substance and determine the temperatures at which these changes occur.
