IICRC Commercial Drying Specialist (CDS) 2025 – 400 Free Practice Questions to Pass the Exam

The concept of heat transfer is fundamental in understanding how energy moves within different mediums and is typically categorized into three primary mechanisms: convection, conduction, and radiation.

Convection refers to the transfer of heat through fluids (liquids or gases) by the motion of the fluid itself. This process involves the bulk movement of molecules within the fluid, which carries heat from one part to another.

Conduction is the transfer of heat through a solid material without any movement of the material itself. It occurs when faster-moving molecules collide with slower-moving ones, transferring kinetic energy directly through the material.

Radiation, unlike the other two mechanisms, involves the transfer of heat in the form of electromagnetic waves, including infrared radiation. This type of heat transfer does not require a medium, meaning it can occur even in a vacuum.

Vaporization, while it involves heat transfer processes in certain contexts, is not considered one of the basic mechanisms for the transfer of heat itself. Instead, it is a phase change process where a substance transitions from a liquid to a vapor, and while heat is involved, it doesn't fit under the umbrella of the primary heat transfer categories.

Understanding these distinctions and definitions is crucial for professionals in the field, especially when dealing with drying processes and how