What temperature management method does an ice-cooled vest utilize?

The correct answer is based on how an ice-cooled vest is designed to function in managing temperature. Ice-cooled vests essentially operate by containing ice within compartments. As the ice within the vest begins to melt, it absorbs heat from the body. This process helps in cooling the wearer, making it effective for preventing heat stress in situations where cooling is needed. The ice provides a significant temperature drop compared to the typically warmer surroundings, allowing for efficient heat absorption.

The vest's cooling mechanism does not involve the circulation of air or liquids in any significant manner; rather, it relies on the direct contact of the ice with the surrounding fabric and skin to achieve the cooling effect. This method can provide immediate relief and does not rely on any additional systems like pumps or external energy sources.

In contrast to this, a vest that pumped air through cooling tubes or circulated chilled liquids would operate on a different principle, primarily relying on the flow and movement of substances, rather than the direct cooling effect of melting ice. These alternatives utilize different mechanisms for heat exchange, which is not applicable to the basic operation of an ice-cooled vest.