ESCO Air Conditioning Practice Exam

0 pounds per square inch absolute is

1. A pressure which cannot be further reduced

2. Absolute zero temperature

3. The same as atmospheric pressure

4. The standard atmospheric pressure

The correct answer is: A pressure which cannot be further reduced

"Pounds per square inch absolute" refers to the unit of measure for absolute pressure, which means the pressure being measured with respect to a perfect vacuum. Option B, "absolute zero temperature," is incorrect as it refers to the coldest possible temperature, not pressure. Option C, "the same as atmospheric pressure," is incorrect as atmospheric pressure is typically measured in pounds per square inch gauge, which is relative to atmospheric pressure. Option D, "the standard atmospheric pressure," is incorrect as the standard atmospheric pressure is typically measured in units of atmospheres.