Final answer:
To calculate the pressure altitude, one uses the equation pa = (29.92 – barometric pressure) × 1,000 + elevation. An example was demonstrated where a barometric pressure of 454 mmHg at 14,000 feet elevation resulted in a pressure altitude of 26,050 feet.
Step-by-step explanation:
To calculate the pressure altitude, we use the provided equation, which incorporates the barometric pressure and the elevation of the location in question. The equation is pa = (29.92 – barometric pressure) × 1,000 + elevation.
Let's consider an example where the barometric pressure is 454 mmHg at an elevation of 14,000 feet. First, we must convert this pressure to inches of mercury (inHg) by dividing by 25.4 (since there are 25.4 mm in an inch), giving us approximately 17.87 inHg.
Now, we'll plug this value into the equation:
pa = (29.92 – 17.87) × 1,000 + 14,000
pa = (12.05) × 1,000 + 14,000
pa = 12,050 + 14,000
pa = 26,050 feet
This calculated pressure altitude indicates the altitude at which the atmospheric pressure would be equal to the observed barometric pressure under standard atmospheric conditions.
The complete question is: Calculate the pressure altitude. use the equation: pa = (29.92 – barometric pressure)1,000 elevation. remember that the standard pressure lapse rate is 1"hg per 1,000 feet. is: