Which statement about CO2 storage pressures is true?

Which statement about CO2 storage pressures is true?

• A. 850 psi at 70°F and 300 psi at 0°F are both correct
• B. 800 psi at 70°F
• C. 900 psi at 70°F
• D. 250 psi at 0°F

Answer: (A)

CO2 storage pressures depend on temperature because CO2 is stored as a liquefied gas and the pressure inside the cylinder is governed by its vapor-pressure curve. At room temperature (about 70°F) the pressure is typically around 850 psi, while at a colder temperature (0°F) the pressure drops to about 300 psi. So a statement that includes both values for their respective temperatures is correct, reflecting how the pressure changes with temperature. The other options give a single pressure value not tied to temperature, which doesn’t accurately describe how CO2 storage pressures behave in practice.

CO2 storage pressures depend on temperature because CO2 is stored as a liquefied gas and the pressure inside the cylinder is governed by its vapor-pressure curve. At room temperature (about 70°F) the pressure is typically around 850 psi, while at a colder temperature (0°F) the pressure drops to about 300 psi. So a statement that includes both values for their respective temperatures is correct, reflecting how the pressure changes with temperature. The other options give a single pressure value not tied to temperature, which doesn’t accurately describe how CO2 storage pressures behave in practice.