When not in actual use, flammable liquids shall be kept in ___ containers.

When not in actual use, flammable liquids shall be kept in ___ containers.

• A. locked
• B. underground
• C. closed
• D. elevated

Answer: (C)

When not in use, flammable liquids must be kept in closed containers to minimize vapor release and reduce ignition risk. These liquids give off vapors that can ignite if they encounter a spark or heat; a closed container limits evaporation and confines any vapors, making spills and fires far less likely. While security or storage location can matter in other contexts, the essential safety step here is containment — keeping the liquid in a closed container prevents vapors from escaping and helps prevent spills.

When not in use, flammable liquids must be kept in closed containers to minimize vapor release and reduce ignition risk. These liquids give off vapors that can ignite if they encounter a spark or heat; a closed container limits evaporation and confines any vapors, making spills and fires far less likely. While security or storage location can matter in other contexts, the essential safety step here is containment — keeping the liquid in a closed container prevents vapors from escaping and helps prevent spills.