Discussion
A manifold pressure gauge measures __________ pressure, so a stopped engine reads ambient.
Answer: D
Correct answer: absolute
An absolute pressure gauge is referenced to vacuum, so it reads the true pressure of the charge rather than its excess over ambient. With the engine stopped the manifold is open to atmosphere through the induction system, so the gauge indicates ambient pressure.
That gives a useful pre-start check - the reading should agree with the local altimeter setting. A gauge measuring differential or gauge pressure would read zero instead, and would also lose its meaning as altitude changed, since the same manifold pressure at sea level and at height represents the same charge density either way only on an absolute scale.
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