Wet Bulb Dry Bulb Humidity Calculator

Dewpoint is the atmospheric temperature below which water droplets begin to condense and become dew.

Wet bulb dry bulb humidity calculator. Enter your actual station pressure not the altimeter setting. Air humidity can be estimated by measuring. Relative humidity dewpoint temp c. To calculate relative humidity in percent hereinafter denoted as rh from dry bulb temperature t and wet bulb temperature t w one can use a well known set of forward analytical psychrometric equations bohren and albrecht 1998.

There is a converter below this calculator if you only know the celsius temperature for the entries required. Dry bulb temperature t db can be measured with a simple thermometer as shown above. Construction different materials react differently to different humidities so this temperature is needed when designing a building in different climates. Snowmaking snow production needs low temperatures and when the humidity decreases the temperature rises.

Wet bulb temp c. Enter the two different temperatures. Enter a temperature relative humidity and actual station pressure. In of mercury mm of mercury millibars hpa.

The entry required is in fahrenheit degrees. Dry bulb temperature and. The wet bulb temperature might not be a widely known measure but it has some valuable functions. This script will determine the relative humidity from the entered dry and wet bulb temperatures data.

Note that continuously air flow around the thermometer is important to evaporate. If the dry and wet bulb temperatures are set to the same value the calculator will show the saturation mixing ratio the amount of water in saturated air at that temperature. Stull 2011 for any pressure such as standard sea level pressure of 101 325 kpa the resulting calculated values of rh can be listed in psychrometric tables. Dry bulb temp c.

Relative humidity is measured using a device called a sling psychrometer this consists of 2 side by side conventional thermometers one of which the wet bulb thermometer has a wetted wick placed at the bottom the other the dry bulb thermometer has no wetted wick. Wet bulb temperature t wb can be measured with a standard thermometer with some wet clothing cotton or similar around the bulb. The calculator will show the saturation mixing ratio in grams of water per kilogram of dry air of a given temperature if the dry and wet bulb temperatures are set to the same value. Calculate dewpoint wet bulb temperature from relative humidity.

Altitude above sea level m. If the air is fully saturated 100 relative humidity the water cannot evaporate so both the wet and dry bulb temperatures are the same. If the air is fully saturated 100 relative humidity the water cannot evaporate so both the wet and dry bulb temperatures are the same.