College

If the gauge pressure of a gas is 114 kPa, what is the absolute pressure?

A. 214 kPa
B. 220 kPa
C. 50 kPa
D. 14 kPa

Answer :

To find the absolute pressure, you need to add the gauge pressure to the atmospheric pressure. Here's how you can calculate it:

1. Understand the terms:
- Gauge pressure is the pressure of the gas relative to the atmospheric pressure.
- Atmospheric pressure at sea level is approximately 101.325 kPa.
- Absolute pressure is the total pressure, which is the sum of gauge pressure and atmospheric pressure.

2. Given values:
- Gauge pressure = 114 kPa
- Atmospheric pressure = 101.325 kPa

3. Calculate absolute pressure:
- Absolute pressure = Gauge pressure + Atmospheric pressure
- Absolute pressure = 114 kPa + 101.325 kPa

4. Calculate the result:
- Absolute pressure = 215.325 kPa

Based on the choices given, the absolute pressure closest to the calculated value is 214 kPa (option A). Although the calculations suggest a slightly higher value, 214 kPa is the approximate choice that fits best.