If the absolute pressure of a gas is 550.280 kPa, its gage pressure is
A. 101.325 KPa
B. 277.280 KPa
C. 448.955 KPa
Here is a good discussio of different types of pressure gauges. Absolute pressure = gauge pressure plus atmospheric pressure.
http://en.wikipedia.org/wiki/Pressure_measurement
To find the gauge pressure, we need to subtract the atmospheric pressure from the absolute pressure. The atmospheric pressure at sea level is approximately 101.325 kPa.
Therefore, to find the gauge pressure, we subtract 101.325 kPa from the given absolute pressure of 550.280 kPa.
550.280 kPa - 101.325 kPa = 448.955 kPa
So, the gauge pressure is 448.955 kPa.
Therefore, the correct option is C. 448.955 kPa.