A barometric altimeter indicates pressure altitude when the barometric scale is set at sea level pressure of

A barometric altimeter indicates pressure altitude when the barometric scale is set at sea level pressure of

• A. 29.92
• B. 29.80
• C. 30.00
• D. 28.92

Answer: (A)

Pressure altitude is the altitude shown when the altimeter is set to the standard sea level pressure. The standard value is 29.92 inches of mercury (1013.25 hPa). When you set the barometric scale to 29.92, the altimeter converts the current pressure to an altitude assuming standard conditions, giving you the pressure altitude. The other numbers are not the standard sea level pressure, so they wouldn’t yield the pressure altitude reading.

Pressure altitude is the altitude shown when the altimeter is set to the standard sea level pressure. The standard value is 29.92 inches of mercury (1013.25 hPa). When you set the barometric scale to 29.92, the altimeter converts the current pressure to an altitude assuming standard conditions, giving you the pressure altitude. The other numbers are not the standard sea level pressure, so they wouldn’t yield the pressure altitude reading.