Discussion
The air pressure in an automobile tire read the __________.
Answer: A
A tyre gauge reads gauge pressure.
A tyre pressure gauge, like most pressure gauges, measures the pressure above the surrounding atmosphere. A tyre showing 30 psi on the gauge actually holds about 30 + 14.7 = 44.7 psi absolute.
The gauge reads zero, not 14.7 psi, when disconnected, which shows it is not reading absolute or atmospheric pressure. A vacuum reading would mean the tyre is below atmospheric pressure, which an inflated tyre is not.
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