HVAC - EPA Certification Practice Exam 2026 - Free EPA Certification Practice Questions and Study Guide

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What is considered the normal atmospheric pressure at sea level?

14.0 lbs. per square inch

13.5 lbs. per square inch

14.7 lbs. per square inch

The normal atmospheric pressure at sea level is 14.7 pounds per square inch (psi). This value is recognized as standard atmospheric pressure and is used in various calculations and applications within HVAC systems and other scientific disciplines.

Understanding this precise measurement is crucial for professionals working in HVAC, as it serves as a baseline for pressure settings and performance calculations in heating and cooling systems. Variations in atmospheric pressure can affect the operation of these systems, particularly in terms of airflow, efficiency, and the behavior of refrigerants.

Recognizing that 14.7 psi is the accepted figure helps HVAC technicians ensure that they are working within proper parameters when servicing or installing equipment and understanding how environmental factors can influence system performance.

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15.0 lbs. per square inch

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