Final answer:
A PCT who accesses a patient's chart without permission commits an invasion of privacy, breaching the confidentiality of the patient's medical records.
Step-by-step explanation:
Invasion of privacy is the tort committed by a Patient Care Technician (PCT) when they access a patient's chart from another unit without a valid reason or the patient's permission. Medical records are considered confidential, and any unauthorized access constitutes a breach of the patient's right to privacy. This action would not usually be considered assault, negligence, or battery as those involve threats of harm, a duty of care breach resulting in harm, or actual physical contact, respectively.