QQuestionPhysics
QuestionPhysics
"At sea level, ISA atmospheric pressure is:
A. 14.7 kPa
B. 10 Bar
C. 14.7 PSI"
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Answer
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Step 1:: Understand the problem and recall relevant concepts
The problem asks for the atmospheric pressure at sea level in three different units: kPa, bar, and psi. Atmospheric pressure is a measure of the force exerted by the weight of the air above a given point. We need to convert the given pressure from one unit to another. The conversion factors between the units are: 1 bar ≈ 100,000 Pa (Pascal) 1 Pa = 1 N/m² (Newton per square meter) 1 psi ≈ 6,894.76 Pa
Step 2:: Convert the pressure from psi to Pa
We are given the atmospheric pressure at sea level as 14.7 psi. To convert this to Pascals, we use the conversion factor:
Step 3:7 psi ≈ 14.7 × 6,894.76 Pa = 101,325 Pa
Step 4:: Convert the pressure from Pa to bar
Now, we convert the pressure from Pascals to bars: 101,325 Pa ÷ 100,000 Pa/bar = 1.01325 bar
Step 5:: Convert the pressure from bar to kPa
Finally, we convert the pressure from bars to kilopascals (kPa):
Step 6:01325 bar × 100,000 Pa/bar × 1 kPa/ 1000 Pa = 101.325 kPa
Final Answer
The atmospheric pressure at sea level is approximately 101.325 kPa, 1.01325 bar, or 14.7 psi.
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