Question
____ is absolute pressure - atmospheric pressure.
Answer
Gauge pressure is absolute pressure - atmospheric pressure.
Its the reading that a pressure gauge would show when used to test the pressure of something
It is zero referenced against atmospheric pressure so if the gauge reads "0 atm" that means there is no pressure other than the existing atmospheric pressure.
flat tire is at an absolute pressure of 1.01×105Pa1.01×105Pa1, point, 01, times, 10, start superscript, 5, end superscript, P, a isn't really all that useful (since being at atmospheric pressure means your tire's flat). The extra pressure in the tire above atmospheric pressure is what will allow the tire to inflate and perform properly.
Because of this, most gauges and monitoring equipment use what is defined to be the gauge pressure PgaugePgaugeP, start subscript, g, a, u, g, e, end subscript . Gauge pressure is the pressure measured relative to atmospheric pressure. Gauge pressure is positive for pressures above atmospheric pressure, zero at atmospheric pressure, and negative for pressures below atmospheric pressure.
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