The PSIA at sea level under standard conditions is _____ psi.

The PSIA at sea level under standard conditions is _____ psi.

• A. 14.696
• B. 1
• C. 5
• D. 29.92

Answer: (D)

PSIA is the pressure measure relative to a vacuum, i.e., absolute pressure. At sea level under standard conditions, atmospheric pressure is defined as 1 atmosphere, which equals 14.696 psi. The same pressure can be written as 29.92 inches of mercury (inHg), and that conversion is 1 atm ≈ 14.696 psi ≈ 29.92 inHg. Since the question asks for psi, the correct value is 14.696 psi. The other numbers don’t fit because 1 and 5 psi are far too low for atmospheric pressure, and 29.92 is listed in a different unit (inHg), not psi, even though it represents the same pressure when converted.

PSIA is the pressure measure relative to a vacuum, i.e., absolute pressure. At sea level under standard conditions, atmospheric pressure is defined as 1 atmosphere, which equals 14.696 psi. The same pressure can be written as 29.92 inches of mercury (inHg), and that conversion is 1 atm ≈ 14.696 psi ≈ 29.92 inHg. Since the question asks for psi, the correct value is 14.696 psi. The other numbers don’t fit because 1 and 5 psi are far too low for atmospheric pressure, and 29.92 is listed in a different unit (inHg), not psi, even though it represents the same pressure when converted.