What consists of several feet of copper tubing used to absorb excessive heat from a liquid?

Heat exchangers are specifically designed to transfer heat between two or more fluids, allowing them to effectively manage temperature without mixing the liquids. In this context, the copper tubing plays a critical role in absorbing excessive heat from a liquid, enhancing the efficiency of the heat exchange process. Copper is commonly used due to its excellent thermal conductivity properties, enabling rapid heat transfer.

The other options mentioned may also involve heat processes, but they do not accurately describe the function and structure highlighted in the question. Thermal regulators typically manage heat flow rather than absorb heat directly. Chillers are systems designed to remove heat from a liquid via vapor-compression or absorption refrigeration, which is a different mechanism than that of a heat exchanger. Heat absorbers can imply various devices used for collecting heat but do not specifically refer to the structured design involving tubing as in heat exchangers. Thus, the choice of heat exchangers is substantiated by its specific function and construction that matches the description given.