Answer :
To find the absolute pressure of a gas when the gauge pressure is given, follow these steps:
1. Understand the Terms:
- Gauge Pressure: This is the pressure of the gas measured above atmospheric pressure. It doesn't include atmospheric pressure in the measurement.
- Absolute Pressure: This is the total pressure exerted by the gas, including the atmospheric pressure.
2. Atmospheric Pressure:
- The standard atmospheric pressure at sea level is approximately 100 kPa.
3. Calculate Absolute Pressure:
- Use the formula:
[tex]\[
\text{Absolute Pressure} = \text{Gauge Pressure} + \text{Atmospheric Pressure}
\][/tex]
- Substitute the known values:
[tex]\[
\text{Absolute Pressure} = 156\, \text{kPa} + 100\, \text{kPa} = 256\, \text{kPa}
\][/tex]
Therefore, the absolute pressure is approximately 256 kPa. The correct answer is B) 256 kPa.
1. Understand the Terms:
- Gauge Pressure: This is the pressure of the gas measured above atmospheric pressure. It doesn't include atmospheric pressure in the measurement.
- Absolute Pressure: This is the total pressure exerted by the gas, including the atmospheric pressure.
2. Atmospheric Pressure:
- The standard atmospheric pressure at sea level is approximately 100 kPa.
3. Calculate Absolute Pressure:
- Use the formula:
[tex]\[
\text{Absolute Pressure} = \text{Gauge Pressure} + \text{Atmospheric Pressure}
\][/tex]
- Substitute the known values:
[tex]\[
\text{Absolute Pressure} = 156\, \text{kPa} + 100\, \text{kPa} = 256\, \text{kPa}
\][/tex]
Therefore, the absolute pressure is approximately 256 kPa. The correct answer is B) 256 kPa.
