Heat content is called enthalpy in the jargon of the air conditioning engineer, so I will use this word from now on. Temperature is easy to measure, relative humidity is considered by some people to be easy to measure and so the diagram is transformed into a useful tool. The heat, or energy, content is difficult to measure directly, so the diagram is cunningly distorted to give the illusion of being based on the relationship between temperature and relative humidity and water vapour content. The Mollier diagram, also called the ix diagram, is based on the relationship between heat content and water vapour content of air. ![]() I will describe first the Mollier diagram and then show the simple transformation that changes it into the psychrometric chart. They are identical in content but not in appearance. The Mollier Diagram is the European version of the Anglo-American Psychrometric Chart. A thorough understanding of how the diagram is constructed is a great help in using it, particularly when exploring thermal properties of moist air. It describes all the properties of moist air that the conservator needs to know. One can make a reasonable career in preventive conservation, and carve out a position of influence and power, through understanding this one diagram. If you think that the slightly skew edges of your Mollier or Psychrometric Diagram are the result of multiple passes of the image through bad copier optics, then this article is for you.
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