Which statement about high‑pressure CO2 storage is correct?

Which statement about high‑pressure CO2 storage is correct?

• A. 850 psi at 70°F
• B. 300 psi at 0°F
• C. 600 psi at 60°F
• D. 200 psi at -10°F

Answer: (A)

High‑pressure CO2 storage is kept as a dense liquid under pressure, so the pressure inside the storage vessel is mainly determined by temperature. At typical room temperature, around 70°F, the system is commonly designed for about 850 psi. That is the standard condition used for CO2 storage in many extinguisher and system applications, reflecting how CO2 under those conditions behaves as a dense liquid rather than a low‑pressure gas. As temperature falls, the pressure drops accordingly, so the other pairings don’t match how CO2 pressure changes with temperature in dense liquid storage. That alignment with the real‑world storage condition is why 850 psi at 70°F is the correct statement.

High‑pressure CO2 storage is kept as a dense liquid under pressure, so the pressure inside the storage vessel is mainly determined by temperature. At typical room temperature, around 70°F, the system is commonly designed for about 850 psi. That is the standard condition used for CO2 storage in many extinguisher and system applications, reflecting how CO2 under those conditions behaves as a dense liquid rather than a low‑pressure gas. As temperature falls, the pressure drops accordingly, so the other pairings don’t match how CO2 pressure changes with temperature in dense liquid storage. That alignment with the real‑world storage condition is why 850 psi at 70°F is the correct statement.