From the current point, draw a line parallel to the lines of constant wet-bulb temperature, until you reach the 100% relative humidity line, and then read the temperature.
You can also read the web-bulb temperature from a Psychrometric chart. This can be physically measured by wrapping the bulb of a thermometer in a wet rag as the water evaporates, latent heat is removed and the temperature drops. The wet-bulb temperature is the coldest temperature you can get through evaporative cooling. This is illustrated by the green line on the chart below. Simply draw a horizontal line from the current point until you hit the 100% relative humidity line, and then read the temperature. You can also read the dew-point temperature directly from a Psychrometric chart. The dew-point temperature is the temperature below which water condenses out of air. We can now plot the point on the psychometric chart. Given the dry-bulb temperature, relative humidity and air pressure, you can calculate the humidity ratio. Weather reports generally give the relative humidity (the actual water-content of air divided by the water content of air at saturation) and the dry-bulb temperature. The y-axis is the humidity ratio - this is the mass of water per unit mass of dry air. The x-axis is the Dry Bulb Temperature - this is the temperature you measure with a shielded thermometer, and is generally the temperature given by weather reports. Since the properties of dry and and water vapor change with air pressure, a psychrometric chart is only valid at a stated pressure. The coldest temperature you can achieve through evaporative cooling - this is known as the wet-bulb temperatureīoth quantities can be calculated with Maple 2016's ThermophysicalData package, and visualized on a psychrometric chart.Ī psychrometric chart gives the properties of humid air. The temperature below which water condenses out of air - this is known as the dew-point This is a simple online dewpoint calculator to find the relative humidity and the dewpoint by knowing the temperature, wet-bulb temperature, and actual station pressure. Given the temperature and the relative humidity of air, you can calculate Relative humidity is the amount of atmospheric moisture present, relative actual air temperature. Weather reports often quantify the water content of air with its relative humidity this is the amount of water in air, divided by the maximum amount of water air can hold at the same temperature. App Preview: Working with Thermophysical Data: Dew-Point and Wet-Bulb Temperature of Air You can switch back to the summary page for this application by clicking here.Ĭalculating the Dew-Point and Wet-Bulb Temperature of AirĪtmospheric air contains varying levels of water vapor.
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