What is 'liquid surge,' and why does it matter for tank vehicle driving?

Pick an answer

1. The natural settling of liquid cargo while the vehicle is parked
2. The forward-and-back or side-to-side movement of liquid cargo inside the tank that shifts weight suddenly
3. A term for the tank's internal pressure buildup unrelated to liquid movement, caused instead by temperature changes
4. A term used only to describe fuel consumption while driving

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