🔍 Key Concepts

• Behavior of CO2 when stored as a liquefied gas (relationship between temperature and pressure) • Typical operating conditions of low‑pressure CO2 fixed systems on ships (refrigerated bulk storage vs. high‑pressure cylinders) • Difference between ambient temperature storage and refrigerated storage for CO2 fire systems

💭 Think About

• Which answer choices look more like high‑pressure cylinder conditions rather than low‑pressure bulk tank conditions? • For a refrigerated low‑pressure CO2 tank, would you expect the temperature to be closer to room temperature or well below freezing? How would that affect the pressure? • Think about why ships might use a low‑pressure bulk tank instead of many high‑pressure bottles—what does that imply about the storage pressure range?

✅ Before You Answer

• Identify which choices show room‑temperature (about 70°F) conditions vs. refrigerated (around 0°F or below) conditions • Compare each pressure to what you would expect in a low‑pressure refrigerated tank (tens of PSI vs. hundreds of PSI) • Eliminate any option that clearly matches high‑pressure cylinder storage rather than a refrigerated low‑pressure tank