Answer :
Final answer:
Gauge pressure in physics involves measuring pressure relative to atmospheric pressure, and for an air test, the gauge should be calibrated in increments no greater than 1 psi. Therefore the correct answer is: a)
Explanation:
It refers to the pressure displayed by a gauge relative to atmospheric pressure. In this context, the gauge used on an air test should be calibrated in increments no greater than 1 psi to ensure accurate measurements.Gauge pressure is a measurement of pressure relative to atmospheric pressure. It's called "gauge" pressure because it's measured using a pressure gauge, which typically displays pressure readings in units such as pounds per square inch (psi), bars, or kilopascals (kPa).
Atmospheric pressure is the pressure exerted by the weight of the Earth's atmosphere. In most situations, atmospheric pressure is relatively constant and is considered to be about 14.7 pounds per square inch (psi) at sea level.Gauge pressure readings indicate how much pressure exists above or below atmospheric pressure. If the gauge reads zero, it means the pressure being measured is the same as atmospheric pressure. Positive gauge pressure indicates pressure greater than atmospheric pressure, while negative gauge pressure indicates pressure lower than atmospheric pressure.
