How do bulkheads differ from baffles in a tank vehicle, based on the CDL manual?

49 CFR 383.119(c); AAMVA CDL Manual Section 8.2.3-8.2.4, p.8-8-2

Bulkheads and baffles sound similar but serve different jobs: one creates separate compartments a driver must balance when loading, the other lets liquid move within a compartment but slows it down. Mixing these up on the exam, and in real driving decisions about weight distribution, is a common and avoidable mistake.