The relationships between these values are illustrated in a psychrometric chart.

Many psychrometric properties are dependent on the atmospheric pressure at the location of the sample.

This temperature is then used to find the relative humidity of the chamber using psychrometric charts.

Use a psychrometric chart to calculate wet bulb temperature, and then add 6-8 F as described above.

The psychrometric constant relates the partial pressure of water in air to the air temperature.

To obtain a good approximation of the effect this would have in a particular situation, the process can be traced on a psychrometric chart.

Thus on average, at a given location or altitude, the psychrometric constant is approximately constant.

The underlying property data for the Mollier diagram is identical to a psychrometric chart.

Some psychrometric charts use dry-bulb temperature and humidity ratio coordinates.

Very complex graph: the psychrometric chart, relating temperature, pressure, humidity, and other quantities.

The thermophysical properties found on most psychrometric charts are:

The relative humidity is determined by comparing the readings of the two thermometers with published psychrometric tables or charts.

It is the thermodynamic wet-bulb temperature that is plotted on a psychrometric chart.

Relative humidity can also be determined by locating the intersection of the wet- and dry-bulb temperatures on a psychrometric chart.

A psychrometric chart is a valuable tool in determining the temperature above which food must be maintained in order to avoid condensation.

This corresponds to an air temperature of 25 C and relative humidity of 50% in the sea-level psychrometric chart.

DBT is indeed an important variable in Psychrometrics, being the horizontal axis of the Psychrometric chart.

The precise relative humidity is determined by reading from a psychrometric chart of wet-bulb versus dry-bulb temperatures, or by calculation.

The psychrometric chart allows all the parameters of some moist air to be determined from any three independent parameters, one of which must be the pressure.

The ASHRAE psychrometric charts since 1961 use similar plotting coordinates.

A psychrometric chart is a graph of the thermodynamic parameters of moist air at a constant pressure, often equated to an elevation relative to sea level.

The ASHRAE-style psychrometric chart, shown here, was pioneered by Willis Carrier in 1904.

The psychrometric ratio is the ratio of the heat transfer coefficient to the product of mass transfer coefficient and humid heat at a wetted surface.

Psychrometric charts are available in SI (metric) and IP (U.S./English) units.

Psychrometric Chart - Detailed psychrometric chart including curves for enthalpy, air mass, and water mass.