In the common law of torts, res ipsa loquitur (Latin for ''the thing speaks for itself'') is a doctrine that infers negligence from the very nature of an accident or injury in the absence of direct evidence on how any defendant behaved. Although modern formulations differ by jurisdiction, common law originally stated that the accident must satisfy the necessary elements of negligence: duty, breach of duty, causation, and injury. In res ipsa loquitur, the elements of duty of care, breach and causation are inferred from an injury that does not ordinarily occur without negligence

Can we conclude that res ipsa loquitur means the thing speaks for itself and is related to causation?
yes