Discussion
The air pressure inside the tire of an automobile read the :
Answer: A
The tyre gauge reads gauge pressure.
A tyre pressure gauge measures how far the air pressure inside the tyre exceeds the surrounding atmospheric pressure. A flat tyre therefore reads zero, even though the air in it is at atmospheric pressure.
Absolute pressure is the gauge reading plus atmospheric pressure. Vacuum pressure is the amount by which a pressure falls below atmospheric, which does not apply to an inflated tyre, and atmospheric pressure is the reference the gauge subtracts, not what it shows.
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