What is the difference between Class I liquids and flammable liquids?

What is the difference between Class I liquids and flammable liquids? 11.15 Explain why an empty gasoline drum can be more dangerous than a full one. Why is a drum containing carbon disulfide more likely to ignite than a drum containing gasoline? 11.17 Under what circumstance can kerosene become even more dangerous and ignitable than gasoline? 11.20 Generally speaking, which is more hazardous, flammable or combustible liquids? Why? 11.22 Identify a cost saving principle that a safety and health manager might bring to a design team for a process needing a solvent.