Gas Fitter Practice Test 2025 - Free Gas Fitter Practice Questions and Study Guide

Convection is the correct choice because it specifically pertains to the transfer of heat through the movement of fluids, which includes both gases and liquids. This heat transfer process occurs when warmer, less dense regions of a fluid rise, while cooler, denser areas sink, creating a circulating flow. This movement is responsible for distributing thermal energy throughout the fluid, which is a fundamental concept in thermodynamics and fluid mechanics.

In contrast, conduction involves the transfer of heat through a solid material without any movement of the material itself, relying on direct contact between particles. Radiation refers to the transfer of heat in the form of electromagnetic waves, which can occur in a vacuum and does not require a medium such as gas or liquid. Insulation does not represent a method of heat transfer; rather, it describes materials designed to slow down heat exchange and maintain temperature. Understanding convection is crucial for applications involving heating and cooling systems in both residential and industrial environments.