What is the mainstream unit of measuring air pressure?
A. Inches of mercury
B. PSI
C. Pounds per square foot
D. Centimeters of mercury
my answer is a.
Depends how old your text is. I use Pascals. PSI is most common in retail engineering. (in your tire for example)
By the way a Pascal is a Newton per square meter.
The mainstream unit of measuring air pressure is indeed inches of mercury (inHg). To get this answer, you could have used the following steps:
1. Recall or look up the units of air pressure commonly used.
2. Evaluate each option provided (inches of mercury, PSI, pounds per square foot, centimeters of mercury) against the given question.
3. Identify the unit that is commonly accepted and widely used as the mainstream unit for measuring air pressure, based on your knowledge or research.
Therefore, based on the steps above, your answer of A. Inches of mercury is correct.