Humidity tables collect temperature and humidity data in graph form. One type compares air temperature and wet bulb temperature to find relative humidity, while another indexes relative humidity and temperature to provide absolute humidity and dew point. Different units and layouts can be used, and some charts are calibrated for higher altitudes or changes in barometric pressure.
A humidity table is a type of graph that collects temperature and humidity data. A humidity graph can take more than one form and can contain many different types of data. One type refers to air temperature and wet bulb temperature to give relative humidity. Another type of humidity table indexes relative humidity and temperature to provide absolute humidity and dew point.
The first type of humidity table compares air temperature, or dry bulb temperature, and wet bulb temperature. The latter is found by detecting the air temperature with a thermometer that has a moistened bulb, usually by wrapping it in a thin layer of damp cloth. This temperature reflects the humidity in the air. The effect is similar to what happens when a human being sweats, making the air cooler. The wet bulb temperature is always lower unless the relative humidity is at maximum or 100%.
Some graphs use air temperature and wet bulb temperature, which are crossed to find relative humidity. Some other versions of this graph use what is known as wet bulb depression, which is the difference between the actual air temperature and the wet bulb temperature. The two types of graphs differ in that they use two ways to express the same value.
The second type of humidity table uses data from the first graph. The air temperature is cross referenced with the relative humidity and the graph gives the absolute humidity and the dew point. Absolute humidity is given as the actual amount of water vapor in the air, expressed in grams of water per cubic meter (g/m3). The dew point is the temperature at which dew will begin to form at a given relative humidity.
Charts of this type may vary in the units used and layout, but they are all used the same way. Graphs for Fahrenheit and Celsius temperatures can be used, depending on where in the world the readings are taken. Some charts may combine both systems of measurement. It is assumed that most humidity tables are calibrated for standard atmospheric pressure at sea level. In some cases, more detailed charts are used for higher altitudes or that take into account changes in barometric pressure.
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