The steam phase diagram (Temperature versus enthalpy) is critical to understanding the phase changes involved with steam, and steam quality. Without mastering the basics of how these diagrams work and some basic understandings such as the constant pressure lines, I was forever confused and I don't want that for you. Thus the video explanation below.
Watch once, watch twice, regardless get these basics down pat. As well, please provide feedback such that we can continually improve the ease of learning this material.
Note - just like it takes a certain amount of energy to convert water to steam, there is a very similar process to convert ice to water in which the temperature does not increase during melting. Thus it is also termed an isothermal process.
As always please comment or ask for further clarification below. If you are struggling with a particular question that I have not solved do not hesitate to send an email.
Mike Grossman, P. Eng.