Answer Key: Self-Test C-1.16
- The gas law that states ”a volume of a gas varies inversely to the absolute pressure, provided the absolute temperature remains constant” is known by what name?
- Boyle’s Law
- When the absolute pressure remains the same and the absolute temperature of a gas decreases, does the volume increase or decrease?
- decrease
- A standard 1.5-ft.3 nitrogen cylinder at 2,200 psig is at 60°F. How many ft.3 of volume will the nitrogen occupy at 50 psig if there is no change in temperature?
- 51.3 ft.3
- If the pressure remains constant and the Kelvin temperature of a gas is doubled, the volume of the gas will increase by what factor?
- 2
- A balloon has a volume of 2.5 m3 on a day when the temperature is 30°C. If the temperature at night falls to 10°C, what will be the volume of the balloon if the pressure remains constant?
- 2.33 m3
- A 6.5-ft.3 sample of nitrogen under a pressure of 26 psig is heated from 77°F to 186°F. What is the new volume if the pressure increased to 32 psig?
- 6.84 ft.3
- Assuming no change in pressure, what is the new temperature (K) when 2 L of gas at 20°C are cooled and contract to 1 L?
- 146.5 K
- A standard nitrogen cylinder has a volume of 1.5 ft.3 at 2200 psig at 60°F. What is the new gauge pressure if the cylinder is heated to 130°F?
- 2,498.1 psig
- A natural gas piping system has an internal volume of 12 m3 and is pressurized with nitrogen to 1,050 kPa at an ambient temperature of 25°C. The next day, the ambient temperature is 10°C. Assuming the nitrogen is now at 10°C and there are no leaks in the system, what is the new gauge reading?
- 992 kPa
- Which gas law states ”the absolute pressure of a gas varies directly with the absolute temperature, provided that the volume of the gas remains constant”?
- Charles Law
- An air compressor inlet receives 410 ft.3 of standard air and charges it to 129 psig. What is the volume of the compressor tank?
- 42.01 ft.3
- An air compressor has a tank that holds 27 ft.3 while at a pressure of 69 psig. How many ft.3 of standard air would it take to fill the tank?
- 153.48 ft.3
- A helium balloon has a pressure of 6 psig and a volume of 0.85 ft.3. The balloon were compressed to a volume of 0.25 ft.3 before it ruptured. What was the pressure of the helium in the balloon when it popped?
- 55.75 psig
- A vessel with a pressure of 106 psig has an air volume of 45 ft.3. Calculate the volume if the air was compressed to a pressure of 201 psig.
- 25.18 ft.3
- A 17-m3 air sample is pressurized to 100 kPa at a temperature of –14°C. The air is heated and the volume expands to 25.5 m3 at a pressure of 120 kPa. What is the temperature (°C) of the air in order to cause this change in conditions?
- 154.1 °C
- A pressure tank for a well pump contains 0.2 m3 of air at 150 kPa of gauge pressure. What is the new air volume when at 400 kPa gauge pressure?
- 0.1 m3
- A hydrogen balloon has a pressure of 16 psig and a volume of 15,000 ft.3 Calculate the required amount of hydrogen (at atmospheric pressure) needed to fill the balloon.
- 31,326.53 ft.3
- A captive argon sample is measured with a volume of 41 m3, a temperature of 39°C and a pressure of 500 kPa. The argon is heated to a point where the conditions change so that the temperature is now 60°C and the volume is now 62 m3. What pressure (kPa) must the argon be in order to cause the new conditions?
- 323.1 kPa
- The pressure of a gas in a container is 22 psig at 19°F. The gas is heated until the gauge pressure reaches 82 psig. What temperature is the gas when the pressure gauge reaches 82 psig?
- 802.1 °F
- The pressure of a gas in a container is 87 psig at 140°F. What will the new gauge pressure be when the gas in the container is cooled to –27°F?
- 58.69 psig
