Posted: August 29th, 2022

In the Data section of the Density Altitude Experiment Worksheet are three table

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In the Data section of the Density Altitude Experiment Worksheet are three tables. Each table provides five different scenarios of sea level pressure, station pressure*, temperature, and dew point temperature for the given airport. Recall that the dew point temperature is a measure of the air’s water vapor content. After analyzing the differences in the airports and the scenarios, develop a hypothesis (i.e., make a prediction) for how the differences in airport elevation and the different scenarios of pressure, temperature, and dew point temperature will impact the air density and the density altitude. First, think about the effect of the airport elevation alone on air pressure and density, and the density altitude. Then, for each scenario in a given table, consider how the calculated value of density altitude should compare to the airport’s elevation. Type your hypothesis in the Hypothesis section of the experiment worksheet. For each scenario, enter the required input data** into the NWS Density Altitude Calculator (NOAA) (Links to an external site.) to calculate the density altitude. Be careful to match the correct units on the density altitude calculator with the units of the given data. Enter the calculated density altitude in the table. *Station Pressure vs. Sea Level Pressure Station Pressure – the actual air pressure as measured at the station, and the pressure value used in the density altitude calculator. Sea Level Pressure – station pressure corrected to mean sea level. This is basically an altitude correction to the actual air pressure at the location so that pressure readings between locations with different elevations can be compared. Observing the difference between station pressure and sea level pressure at a given location gives you a sense of how elevation alone affects air pressure and air density. For reference, in a standard atmosphere (Skybrary), (Links to an external site.) the air pressure at sea level is 29.92 in. Hg, and, in the lower atmosphere, air pressure decreases at a rate of about 1 in. Hg per 1000 feet of elevation gain (review the discussion of air pressure in Chapter 1). See Chapter 8 for more details about the differences between station pressure and sea level pressure. **The NWS density altitude calculator is valid for any location. The calculator input data is: station pressure, air temperature, and dew point temperature. The input data does not include the station (airport) elevation. Verify this by inspecting the density altitude formula (PDF) (NWS) (Links to an external site.) used by the calculator. Think about why the station elevation is not needed to calculate density altitude if the station pressure is known (hint: recall how air pressure changes with elevation, from Chapter 1). Conclusions After completing the tables, analyze your results, then draw some conclusions by formulating a short discussion for each of the prompts 1-5 below. Type your discussions for each of the prompts in the Conclusions section of the experiment worksheet. Evaluate the correctness of your hypothesis based on the experiment results. After making a rough comparison of the “average” (ball-park) density altitude value for each airport, explain why station elevation has the greatest impact on the value of the density altitude. Analyze the data for each airport/station elevation separately to determine which factor – station pressure, temperature, or dew point temperature – has the MOST affect on density altitude. Provide some justification for your answer. Analyze the data for each airport/station elevation separately to determine which factor – station pressure, temperature, or dew point temperature – has the LEAST effect on density altitude. Provide some justification for your answer. Make the appropriate choices below (High OR Low) to create the combination of factors that creates the highest value of density altitude: High/Low station elevation High/Low temperature High/Low dew point temperature Then, develop a sentence that summarizes the conditions that create a high density altitude situation.

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