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If the pressure at point A is P and the atmospheric pressure is Pa, then the gauge pressure is equal to:

If the pressure at point A is P and the atmospheric pressure is Pa, then the gauge pressure is equal to: Correct Answer P - P<span style="position: relative; line-height: 0; vertical-align: baseline; bottom: -0.25em;font-size:10.5px;">a</span>

CONCEPT:

Atmospheric Pressure:

  • The pressure of the atmosphere at any point is equal to the weight of a column of air of unit cross-sectional area extending from that point to the top of the atmosphere.
  • At sea level, the atmospheric pressure is given as,

⇒ Pa = 1.013×105 Pa = 1.013 bar

Absolute Pressure:

  • It is the total pressure at a point.

Gauge Pressure:

  • Gauge pressure is the difference between absolute pressure and atmospheric pressure.
  • Gauge pressure is also known as relative pressure.
  • The measured pressure is compared to the standard atmospheric pressure at sea level.

​⇒ Pg = P - Pa

Where Pg = gauge pressure, Pa = atmospheric pressure, and P = absolute pressure

EXPLANATION:

  • Gauge pressure is the difference between absolute pressure and atmospheric pressure.

​⇒ Pg = P - Pa

Where Pg = gauge pressure, Pa = atmospheric pressure, and P = absolute pressure

  • Hence, option 3 is correct.

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