A pressure gauge on an air cylinder reads 8 atm. What is the absolute pressure (in atm) inside the cylinder?
To find the absolute pressure inside the cylinder, you need to add the atmospheric pressure to the gauge pressure. The gauge pressure is the pressure measured by the pressure gauge, while the atmospheric pressure is the pressure exerted by the Earth's atmosphere.
The atmospheric pressure varies depending on factors such as elevation and weather conditions. On average, the standard atmospheric pressure at sea level is around 1 atm.
In this case, the pressure gauge reads 8 atm, which is the gauge pressure. Therefore, to find the absolute pressure, you add the atmospheric pressure (1 atm) to the gauge pressure:
Absolute pressure = Gauge pressure + Atmospheric pressure
Absolute pressure = 8 atm + 1 atm
Absolute pressure = 9 atm
So, the absolute pressure inside the cylinder is 9 atm.