When applying the principles of atmospheric pressure and vacuum:
A) Vacuum is pressure greater than atmospheric pressure
B) A perfect vacuum is 30 in. Hg
C) When air becomes colder, it expands and becomes lighter
D) Atmospheric pressure at sea level is 14.7 psi

Question

Quizplus · Accepted Answer

Atmospheric pressure at sea level is commonly measured as 14.7 pounds per square inch (psi) and is also known as one atmosphere (atm). Choices A, B, and C are incorrect statements. A vacuum is pressure lower than atmospheric pressure, a perfect vacuum has no pressure, and as air becomes colder, it contracts and becomes denser.

When Applying the Principles of Atmospheric Pressure and Vacuum