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If a gauge reads 20 kPa vacuum, what is the absolute pressure of the system?

A. 121.3 kPa
B. 20 kPa
C. -20 kPa
D. 81.3 kPa

Answer :

The absolute pressure of the system is 81.3 kPa (option D). To determine the absolute pressure of the system when a gauge reads -20 kPa (vacuum), we need to consider the relationship between absolute pressure and gauge pressure.

Absolute pressure is the total pressure exerted by a fluid, including atmospheric pressure. Gauge pressure, on the other hand, measures the pressure relative to atmospheric pressure.

When a gauge reads -20 kPa (vacuum), it means the pressure is below atmospheric pressure. To convert gauge pressure to absolute pressure, we add the atmospheric pressure to the gauge pressure.

Since the gauge reads -20 kPa, we can assume the atmospheric pressure is approximately 101.3 kPa.

Adding the gauge pressure to atmospheric pressure:

Absolute pressure = Gauge pressure + Atmospheric pressure

Absolute pressure = -20 kPa + 101.3 kPa = 81.3 kPa

Therefore, the absolute pressure of the system is 81.3 kPa (option D).

Learn more about gauge pressure, absolute pressure here:

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