The difference between the pressures inside and outside a tire is called the absolute pressure.

Name: The difference between the pressures inside and outside a tire is called the absolute pressure.
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Quizplus · Accepted Answer

The difference between the pressures inside and outside a tire is called the gauge pressure. The absolute pressure is the total pressure, including atmospheric pressure, measured relative to a perfect vacuum.

The Difference Between the Pressures Inside and Outside a Tire