Question

when you add more heat to boiling water why doesn't the temp change

Answer 1

When water is boiling, the temperature remains constant at 100 degrees Celsius (212 degrees Fahrenheit) because the added heat is being used to convert the liquid water into water vapor. This process, known as latent heat of vaporization, requires a constant input of energy to break the bonds between water molecules and allow them to escape as steam. Once all the liquid water has been converted to gas, the temperature of the system can start to rise again.