College

15. If a gas has a gauge pressure of 156 kPa, its absolute pressure is approximately:

A. 256 kPa
B. 300 kPa
C. 100 kPa
D. 56 kPa

Answer :

Gauge pressure is measured relative to atmospheric pressure. To find the absolute pressure, we need to add the atmospheric pressure to the gauge pressure. Assuming the atmospheric pressure is [tex]$100 \text{ kPa}$[/tex], we have:

[tex]$$
\text{Absolute Pressure} = \text{Gauge Pressure} + \text{Atmospheric Pressure}
$$[/tex]

Plugging in the values:

[tex]$$
\text{Absolute Pressure} = 156 \text{ kPa} + 100 \text{ kPa} = 256 \text{ kPa}
$$[/tex]

Thus, the absolute pressure is approximately [tex]$256 \text{ kPa}$[/tex].