![]() ![]() From a meteorological perspective, the interaction among the pressure, temperature, and humidity plays a key role in weather. Variations in ambient pressure will have an effect on the maximum water vapor capacity, which can be expressed by the vapor pressure of the water. This demonstrates that at lower temperatures air can hold less water as vapor. Follow the green line to the dewpoint temperature.Īs the temperature decreases, the maximum water vapor capacity also decreases.Follow one of the white lines up to the blue curve of relative humidity.Find the air temperature on the x-axis.To determine the dew point temperature from relative humidity and air temperature: The x-axis of the chart shows various temperatures and the curved axis on the upper left side shows the dew point, also known as the wet bulb temperature. This psyhrometric chart is in US units: Reading A Psychrometric Chart The psychrometric chart below is in SI units: To effectively determine the dew point temperature, psychrometric charts are often used. Specifically, the dew point describes the temperature that air at constant pressure must achieve so that the relative humidity is 100%. In addition to the heat index, the dew point is a common expression of humidity used in weather-related applications. Although the actual temperature is the same, due to variations in the relative humidity, the temperature will feel 10☏ warmer. ![]() If the relative humidity increases to 100%, the temperature will feel like 80☏. Using the above chart, at 10% relative humidity, the temperature will feel like 70☏. ExampleĪs an example of using a temperature – humidity relationship chart, assume an actual temperature of 75☏. By matching a known relative humidity value with a known actual temperature, the chart can be used to find the apparent temperature relating the two. An example of such a chart is shown in the following figure: Reading A Temperature – Humidity Relationship ChartĪ temperature – humidity relationship chart has the air temperature as column headings and the relative humidity labeling the rows. This chart is a matrix that is used to evaluate the effect of the relative humidity and temperature to present the apparent temperature. Determining The Temperature – Humidity RelationshipĪ temperature – humidity relationship chart is the most common way to determine the relationship between the two. This is commonly expressed as the heat index, which indicates that the temperature will seem higher as humidity increases. At higher humidity levels, air will feel warmer, and at lower humidity levels, air will feel cooler. Rather, humidity will affect the perception of temperature. The humidity level does not actually affect the temperature. When the relative humidity reaches 100%, the volume has become saturated and can no longer hold any more water as vapor, and additional water will condense out as liquid. ![]() It is calculated as the actual amount of water vapor in a volume of air divided by the maximum amount of water vapor the volume can hold. The relative humidity relates the absolute humidity to the temperature. It is determined by dividing the mass of water vapor in the volume by the total mass of air and water vapor in the volume. The absolute humidity expresses how much water vapor is in a volume of air without considering the temperature of the air. The relative humidity is determined as a function of the absolute humidity, and varies with temperature. This means that if temperature increases, the relative humidity will decrease. Temperature and relative humidity are inversely proportional. The Relationship Between Temperature And Humidity Reading A Temperature – Humidity Relationship Chart.Determining The Temperature – Humidity Relationship.The Relationship Between Temperature And Humidity. ![]()
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