Describe heat transfer systems with suitable examples. 

Heat transfer refers to the process of moving heat from one place to another. There are three main types of heat transfer: conduction, convection, and radiation. Understanding these three types of heat transfer is important in many engineering and scientific applications, including heating and cooling systems, food processing, and energy production.

1. Conduction: Conduction is the transfer of heat through a solid material without any movement of the material itself. This occurs when two objects at different temperatures are in contact, and heat is transferred from the hotter object to the cooler object. For example, when a metal rod is heated at one end, the heat is transferred through the rod to the other end by conduction.

2. Convection: Convection is the transfer of heat by the movement of a fluid, such as a gas or liquid. This occurs when heat is transferred by the movement _______ _______ ________ ________ __________.
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