A cooling curve for some substance is shown below. Which of the line segments (I-V) represents the liquid-to-solid transition? 
Definitions:
Volume-Control Device
A device used in intravenous therapy to precisely control the volume of fluid delivered to the patient.
Mini-Infusion Pump
A small, portable device used to deliver medications and other therapeutic agents directly into a patient's circulatory system over a prolonged period.
IV Bolus Injection
The rapid administration of a medication or fluid directly into a vein in a single, swift dose.
Intravenous (IV) Insertion
The procedure of inserting a needle or catheter into a vein to administer fluids or medications directly into the bloodstream.
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