The psychrometric chart displays several quantities: dry bulb temperature, dew point temperature, wet bulb temperature, humidity ratio, specific enthalpy, specific volume, relative humidity, and water vapor pressure being the top nine. Also, barometric pressure (or equivalently, altitude) is given.
Margaret Roach has been writing about gardening for many years. She has a 2.3-acre garden in Massachusetts and shares helpful info like this VEGETABLE-STORAGE chart from the University of Wisconsin on her blog. Very helpful!
Manual Humidifier Control. Tap Humidifier under the humidity tab to access the humidifier screen. To control your humidifier’s status, tap On/Off. Tap the arrows on the Humidifier Control icon to set the desired indoor humidity level. You should consult the Suggested Indoor Relative Humidity Chart at the bottom of the screen when determining what level to set your relative humidity.
The Kestrel 4200 Pocket Air Flow Tracker monitors and reports an extensive list of environmental parameters — from temperature (Celsius or Fahrenheit) to barometric pressure, altitude, relative humidity, and more**. Like all Kestrel 4000-series meters, the Kestrel 4200 also stores that information and even charts up to 2000 data points for later analysis. The Kestrel 4200 has all available monitoring functions of the Kestrel 4000, plus Humidity Ratio and Air flow (CFM).
Assume that the outside air temperature is 32°C with a relative humidity φ = 60%. Use the psychrometric chart to determine the specific humidity ω [18 gm-moisture/kg-air], the enthalpy h [78 kJ/kg-air], the wet-bulb temperature Twb [25.5°C], the dew-point temperature Tdp [23°C], and the specific volume of the dry air v [0.89m3/kg]. Indicate all the values determined on the chart.
Use this table to find out how much water is available from the air (water vapour density or "absolute humidity") when you know local air temperature and relative humidity. This chart uses Système International (metric) units. See a sample of this table.
This chart, created by Gwen Spicer, Principal Conservator at Spicer Art Conservation, shows the delicate balance of temperature, relative humidity, and mold growth. Preventing mold in your collection is essential to protecting your artifacts!