Question

Define boiling point of a liquid. At what temperature in the Kelvin scale does water boil ? Explain what happens when we supply heat energy to water till it changes its state. What is this heat energy called ?

Answer 1

• The boiling point of a substance is the temperature at which the vapor pressure of the liquid equals the environmental pressure surrounding the liquid.
• water boils at 372 K
• When more heat is supplied to a boiling water its temperature does not change . In this case the extra heat supplied to the water is used for phase transformation of water and known as Latent heat of vaporization.