Recall that air - moist air - is made of dry air and water vapor. And that brings us back to air, and the molecules it comprises. It’s not the best definition (because of things like quantum mechanics and zero point energy), but it’s fine for this discussion. One definition of temperature is that it’s a measure of the kinetic energy of the molecules. It can be measured in a number of ways and is one of the three independent quantities we need to define a psychrometric state point. It’s the temperature we’re talking about when we use that word without any descriptors in front. He’s got a separate chapter on each quantity. I’ll give you what I think is the essential knowledge you need about them. Now, let’s take a look at each one individually. Here’s Gatley’s list of the top 9 psychrometric quantities, sorted by whether we can get them by measurement or have to calculate them. It could be wet bulb temperature, dew point temperature, relative humidity, or any of a number of other quantities. A quantity that tells us how much water vapor is in the air.
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