MC 331 containers carry products that have _________.

• A. Low Vapor Pressures
• B. High Vapor Pressures
• C. Medium Vapor Pressures
• D. Variable Vapor Pressures

Answer: (B)

MC 331 containers are built to transport nonliquefied compressed gases, which have high vapor pressures at ambient temperature. Because these contents exist as gases at room temperature, their vapor pressure inside the vessel is high, so the tank is designed to withstand that pressure and include relief mechanisms to vent gas safely if needed. That’s why these containers carry products with high vapor pressures. If the contents had low vapor pressure, or were typical liquids that don’t vaporize readily at room temperature, a different container type would be used.