When you complete this lesson, you will be able to explain the relationship between energy, temperature, and the phases of water. You will also be able to describe the concept and importance of latent heat, the heat associated with phase changes of water without a temperature change. Given the weights of both steam and liquid water in a vessel, you will be able to calculate quality and moisture content. You will be able to explain the relationship of a subcooled liquid, saturated liquid, saturated steam, latent heat of vaporization, and superheated steam on a provided temperature/enthalpy diagram.